This week, I’ve done the dirty work for you: I’ve amassed a collection of vital details about the three most popular systems—Microsoft’s (MSFT) Xbox 360, Sony’s (SNE) PlayStation 3 and Nintendo’s Wii—so that you can get a handle on what each offers and what it will cost you.

Nintendo Wii

Nintendo recently dropped the Wii’s price, for the first time, to $200 from $250. The Wii Console comes with a controller, an additional controller called a Nunchuk, and the Wii Sports game, which includes baseball, tennis, golf, bowling and boxing. It holds 512 megabytes of flash memory, but you can increase this by inserting SecureDigital memory cards. It also accepts high-capacity SD cards, or SDHCs, of up to 32 gigabytes.

The couch-potato world of videogamers was shaken up when the Wii, with its motion-sensitive remote control, was introduced about three years ago. Users can play Wii Golf, for instance, by swinging the remote like a golf club. In September, Nintendo added to its lineup a $20 remote-control accessory called Wii MotionPlus that was designed to add more precision to game motions. I tested this snap-on piece and found that it did make the Wii’s motions feel more realistic. But it works only with Wii MotionPlus games—and there are only six of them; 10 more are planned for 2010.

Wii encourages users to move around in more ways than just waving a remote: Its Wii Balance Board, which comes with the Wii Fit Plus game in a $100 bundle, works like a digital exercise step. It records the body’s weight shifts and movements for activities from yoga to wake-boarding.

The Wii accesses the Internet and lets users compete online against others. About 655 packaged games are available for between $30 and $50. Also, you can use pre-purchased Nintendo Points to buy and download about 150 WiiWare games and over 325 titles from the older Virtual Console library. Each game costs between 300 and 1,500 points, or between about $3 and $15.

WiiConnect24 can send messages from one Wii to another over the Internet, as long the two users exchange “Wii numbers.” Users can also surf the Web with Wii’s Opera browser. But beyond this, no other Web features—like downloadable movies, social-networking applications or streaming music—will work on this system.

Parental controls can be set on the Wii to restrict kids from using the Web browser, playing games that have a certain rating or communicating online.

Microsoft Xbox 360

Microsoft recently stepped up its game by adding features to its $200 Xbox 360 that make it well-rounded rather than strictly geared toward serious gamers. People who buy the Xbox LIVE Gold membership, for $50 a year, get applications for Facebook, Twitter, the Last.fm music-streaming service, online multiplayer game play, video chat, Netflix (Netflix subscription required), photo sharing via the Xbox, and movie or photo “parties” that allow users to watch a movie simultaneously with seven other friends.

Xbox LIVE Silver membership is free and includes basic features like voice and text chat, as well as access to the Zune video library’s 20,000 TV shows and movies to buy or rent. The Xbox also allows media-streaming over a home network. To wirelessly connect to the Internet on your Xbox, you’ll need to buy a $100 Wi-Fi adapter. By contrast, the Wii and PlayStation 3 have built-in Wi-Fi.

Anyone who owns a Microsoft Zune media player can buy a TV show or movie and download it to an Xbox or PC as well as the Zune. Zunes can be plugged into the Xbox to play music, as can Apple (AAPL) iPods.

The base Xbox comes with a wireless controller and 512 megabytes of memory. For $100 more, the Elite Holiday Bundle includes a 120-gigabyte hard drive, headset, wireless controller, and two games: “LEGO Batman: The Videogame” and “Pure.” More than 1,200 games are available for the Xbox, mostly costing between $29 and $60. About 350 of the games can be downloaded from the Xbox LIVE Arcade (costing 400 to 1,600 points, or $5 to $20) or the Games on Demand library.

Microsoft confirmed plans to introduce Project Natal, a system that lets people operate games with gestures and body movements rather than remote controls. Natal will work with all Xbox 360 consoles. Microsoft won’t confirm a date.

Family settings let parents control whether their kids play games online and with whom they play, as well as the ratings of the games. A Family Timer regulates how long kids play.

Sony PlayStation 3

Sony’s PlayStation, like the Xbox 360, is designed with serious gamers in mind. Its base version costs $300 and includes a 120-gigabyte hard drive and a DualShock 3 wireless controller; $50 more buys a version with a 250-gigabyte hard drive. Both systems can be upgraded with any standard 2.5-inch hard drive. The PlayStation is also a Blu-ray disc player.

Like the Xbox, the PlayStation 3, or PS3, now offers extra features, but these features are all included in the PlayStation Network, which is free (not $50 yearly like Xbox LIVE Gold). These PlayStation Network extras include Netflix (NFLX) instant streaming, a Web browser, photo slide shows, the ability to stream media over a home network to the PS3, a Facebook application that shares game information with friends and the PlayStation Network video-delivery service, where users can purchase 2,400 high- and standard-definition movies and 15,000 TV episodes.

The PS3 and the PlayStation Portable, Sony’s portable gaming device, are married in many ways. A new feature called Blu-ray Portable Copy lets users make a free standard-definition copy of some Blu-ray movies for transfer to a PlayStation Portable. Remote Play lets people stream media files from the PS3 to the PlayStation Portable in Wi-Fi hot spots or remotely turn the PS3 on or off using the PlayStation Portable. Movies and TV shows from the PlayStation Network can be transferred to either system, so you can start a movie on a big-screen TV and finish it on the PlayStation Portable; the same can be done for games.

About 400 games are available on Blu-ray for the PS3; these cost between $30 and $60. More than 150 titles, costing between $3 and $40, can be downloaded directly to the PS3. Sony confirmed that it will release a motion-sensing controller, but it hasn’t set a date.

Parental restrictions for the PS3 include the ability to restrict games, DVDs and Blu-ray discs with certain ratings. Parents can also limit monthly spending or Web browsing.

Games: A Cheat Sheet

Here are some of the key differences among three popular videogame systems.

Email: mossbergsolution@wsj.com

Write to Katherine Boehret at mossbergsolution@wsj.com

Corrections & Amplifications

Xbox LIVE Gold costs $50 a year. A previous version of this story incorrectly stated in the second reference to the price that it costs $50 monthly. Also, the Xbox 360 can be connected to the Internet via an ethernet cable for free, as well as via Wi-Fi. A previous version of this story incorrectly stated that connecting your Xbox to the Internet would require the purchase of a Wi-Fi adapter.

I get confused by all the different models of the BlackBerry — Bold, Storm, Curve, Pearl and so on. Can you briefly explain the differences?

There are too many models to list here, because RIM, the maker of BlackBerry, makes varying versions for competing wireless carriers, and these may have different features, even if they look the same. However, here’s a quick breakdown of the main flavors.

The Bold is the top-of-the-line BlackBerry, relatively large and costly, with a wide keyboard and a big, vivid screen. The Curve is its little brother — still sporting a good, full, keyboard, but lower-priced, smaller and lighter. The newest Curve, called the 8900, has a beautiful screen and is even sleeker than its predecessor.

The Pearl is a slimmer, low-priced, more fashion-oriented model with a truncated keyboard that has two letters on each key and relies on software to guess which one you meant to hit. The Pearl Flip is much like the Pearl, except, as its name implies, it’s a flip phone.

The Storm is the BlackBerry line’s most direct competitor to the Apple iPhone. It’s the only BlackBerry without a physical keyboard, instead relying on a large, beautiful touch screen for typing and navigation. Unlike on the iPhone, however, the Storm provides physical feedback each time you press down on the screen.

I’d be interested in the new, tiny iPod Shuffle, except that I dislike Apple’s earbuds. And, because they have now moved the playback controls to the earbud cord, I can’t use my favorite third-party set. What are my options?

Well, one option is to buy the old model of the Shuffle, which Apple is keeping on the market. It’s larger, but still very small, and has the controls on the player itself, rather than on the earbud cord, so you can use plain old earbuds or headphones from other companies. Plus, at $49, it’s $30 less, though it has only 25% of the capacity of the new one and lacks the new model’s voice features.

Another, costlier, option is to buy better earbuds that have the new controller built in. Apple sells a pair of $79 in-ear buds with a control module on the cord. They were designed for the iPod Touch, but the company says they work perfectly with the new Shuffle. Several other headphone companies, such as Klipsch, have announced plans to offer either headphones or adapters with Shuffle-compatible controls in coming months.

Is it safe to upgrade my Vista PC to the beta version of Windows 7?

Since it is a beta version, there is always some danger of problems. But I have upgraded a couple of Vista computers with no special tricks or help, and with no significant problems. Still, there are a couple of caveats. First, Microsoft will be replacing the beta with a more polished “release candidate” that could involve a re-installation process, so you may want to hold off. Second, Microsoft isn’t guaranteeing that every hardware feature on every computer or peripheral will work properly under the pre-release versions.

• You can find Mossberg’s Mailbox, and my other columns, online free of charge at the new All Things Digital Web site, http://walt.allthingsd.com.

Amazon (AMZN) launched a new service called Amazon Video on Demand, which allows users, for a fee, to watch any of 40,000 TV episodes or movies, in real time, on their Windows and Macintosh computers, and on specially equipped Sony Bravia TV sets. This service replaces an earlier Amazon video offering called Unbox.

I have been testing Amazon Video on Demand and I found it worked well, although it has some limitations. The user interface is clean and smart, the quality is good if you have a fast Internet connection, and there are some clever features. On the downside, it works poorly with the slow connections typical in places like hotels. And there are some studio-imposed limits on what content is offered and how you can view it.

To date, there have been three major models for legally getting TV shows and movies from the Web.

In one, best represented by Apple’s (AAPL) widely used iTunes store, the TV shows and movies are ad-free, but you pay for each. All of this content is downloaded to your Windows or Macintosh computer or your Apple TV set-top box for later viewing, even when you’re not connected to the Internet — though on Apple TV you can start watching while the material is being downloaded.

A second model, best represented by the studio-owned Hulu.com, presents movies and TV shows on a Windows or Macintosh personal computer free of charge, but requires you to watch commercials that can’t be skipped. The TV shows and movies you view on Hulu are “streamed” rather than downloaded, meaning they are meant to be viewed immediately, in real time, rather than stored for viewing when you’re not connected to the Internet.

The third online model is best represented by Netflix (NFLX), the popular DVD distributor. It offers a “Watch Instantly” streaming option on Windows PCs or on TVs equipped with a special set-top box, for a small portion of its large catalog of TV shows and movies. These videos are ad-free and don’t carry an individual charge, but require a monthly subscription fee.

The new Amazon Video on Demand service is a hybrid of these others. As on iTunes, the TV shows and movies it offers are ad-free and purchased individually, don’t require a subscription, and work on both Windows and the Mac, plus on one type of set-top box. In Amazon’s case, that’s Sony’s Bravia Internet Link, a $299 device that works only with Sony (SNE) TVs.

But, like Hulu and Netflix and unlike Amazon’s older Unbox service, the new Amazon Video on Demand service offers videos via real-time streaming. In many cases, it also allows downloading, iTunes-style, to Windows PCs (but not Macs) and to TiVo devices attached to a TV. The videos can’t be streamed in real time using a TiVo (TIVO).

Amazon’s streaming videos are viewed in any of the major Web browsers and don’t require any special software. I tested the new service on both Windows PCs and Macs, and on a Sony Bravia TV equipped with the $299 adapter box. In my tests, Amazon’s videos looked quite good over a fast Internet connection. However, on a typically lousy hotel Internet connection, the movies were often grainy and kept stuttering.

The new service doesn’t yet offer videos in high definition, something Apple just announced this week it is adding for some TV shows. Amazon says it is working on HD.

Amazon’s user interface for the new service is very nice. All of your purchased videos are available in a library stored on the company’s servers, so you can easily watch them again and again if they are purchased, or resume a partly watched rental. And the service remembers where you stopped watching a video and resumes it at that point, even if you started it on, say, a Dell (DELL), and resumed it on a Mac.

On the downside, the new Amazon service isn’t always simple or consistent. For instance, you can watch only two videos at a time, and not all titles can be either streamed and downloaded, or be either purchased or rented. Most rentals last 24 hours, but some differ.

Selection was OK, but not great. Because of studio policies, many current and recent movie hits aren’t available. There are gaps as well in the TV selection. For example, while iTunes offers the current second season of the excellent “Mad Men” series, Amazon has only the first season.

Prices also can be confusing. Amazon rents most movies for $3.99 and sells them for between $9.99 and $14.99. TV shows generally cost $1.99. But some titles carry different prices, albeit these are often lower.

All in all, Amazon Video on Demand is a good service for people who prefer paying for ad-free TV shows and movies, and is another strong step in the Internet’s rising competition with traditional TV.

Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

I have a USB cell phone data card that I use with my laptop. This card offers me world-wide connectivity wherever there is GSM cellphone service available. Is there an adapter that will allow me to use this card with the iPod Touch?

I know of no such adapter, nor of the software that would be needed to make one work. However, although the iPod Touch has no cellphone capability, it does include Wi-Fi, which can give you high-speed Internet access world-wide whenever you are in range of a Wi-Fi wireless network.

What U.S. cellphone service provider should I consider when purchasing a new contract and phone that can be easily used in most western European countries and also get good coverage in the U.S.?

In the United States, the only two major carriers that use the technology compatible with European networks are AT&T and T-Mobile. As to which has better coverage in the U.S., my own anecdotal experience is that this varies greatly depending on where you are, and that neither has coverage that’s as good as Verizon’s in as many major cities. However, Verizon (like Sprint) uses a technology that isn’t compatible with European networks, though it has one or two phone models that include both technologies.

I have just switched to the Mac from Windows. Is there a tutorial somewhere on how to use the Mac user interface and operating system?

There are a couple of books on switching to the Mac, which you can find at online bookstores. Also, Apple maintains two free, illustrated online tutorials called “Mac 101″ and “Switch 101,” the latter being specifically for former Windows users. They are available at apple.com/support/mac101 and apple.com/support/switch101.

You can find Mossberg’s Mailbox, and my other columns, online free at the All Things Digital Web site, http://walt.allthingsd.com.

But there’s more than one way to get a strong, fast Internet signal all over your house. You aren’t limited to using a single wireless router. You don’t have to install a bunch of complicated wireless “range extenders.” And you don’t have to snake networking cables through your walls.

Instead, there’s a simple alternative that’s often overlooked: Using small gadgets called Powerline adapters, you can route your Internet connection around your house over your regular electrical power lines, the ones already in your walls. It really works, it’s fast and it doesn’t disrupt your electrical system. Even better, it requires zero technical skill.

You just plug one of the adapters into a standard electrical outlet near the place where your Internet connection enters your home. Then, you connect the adapter to your wired or wireless router. Next, you plug a second, identical adapter into an electrical outlet in a distant room where you lack an Internet connection. Finally, you plug a computer (or even a wireless access point) into that second adapter. There’s no setup, no required software and no technicians or tools are needed.

When you plug in a computer into the second Powerline adapter, it’s as if that computer was right next to your cable or DSL modem and router. You are on the Internet at full speed. If you plug a Wi-Fi wireless access point into the second Powerline adapter, it will create a wireless network in and around the distant room, which multiple computers can use.

I first reviewed these Powerline adapters in 2003. I liked them, but they were a little slow and never took off. Now, however, one of the leading home network product makers, Netgear, offers a whole line of faster Powerline adapters.

I’ve been testing one of Netgear’s newest models, the XE104, which costs $100 per adapter, and I can heartily recommend it. It couldn’t be simpler or more effective. In my tests, the XE104 gave me wicked-fast connections. I tried plugging Windows and Macintosh laptops directly into the adapters in rooms where my wireless signal was weakest. I also tried plugging a Wi-Fi wireless access point into an XE104 adapter and picking up the connection wirelessly on the laptops. (An access point is a wireless gadget that takes a wired Internet connection and propagates it through the air.)

In all scenarios, the Netgear XE104 adapters delivered nearly the full speed of my Internet service, which in my case is very fast — 15 megabits per second downstream and two mbps upstream. In fact, the XE104 can handle speeds up to 85 mbps, far faster than any common connection.

You can use up to four Netgear adapters at once, and the company claims they will cover a 5,000-square-foot home. Netgear includes optional software to encrypt your Powerline connection, but this is needed only if you share an electrical system with other families.

Linksys, Belkin and other companies also make Powerline adapters, sometimes called bridges. But Netgear is the leader in this category, and I didn’t test the other brands.

The XE104 is a small, white rectangular gadget about 4 inches high, 3 inches wide and 1.5 inches thick. It carries a standard two-pronged electrical plug and mounts right into the wall outlet.

On the side, there are four standard Ethernet network ports, like the kind on your router and laptop. Netgear includes a short Ethernet cable so you can connect the first adapter to your router and the second one to a PC or a wireless access point.

The four Ethernet ports are what make the XE104 a “switch.” They allow you to connect each adapter to multiple devices. For instance, the first adapter can be connected both to your router and to a PC. The second might be connected to a PC, a wireless access point and a device like a game console.

Netgear makes a similar model without the multiple Ethernet ports, called the XE103, for $80. There’s also a costlier model that goes up to 200 mbps, though that’s overkill for 99% of people.

The company also makes a Powerline adapter with a built-in wireless access point for the distant room, the $150 WGXB102 model. This saves you the cost and hassle of buying and connecting a separate access point. But it’s slower and uses older technology. In my tests, it was less than half as fast as using the XE104 with a separate, modern wireless access point.

Unfortunately, like a lot of network-equipment makers, Netgear is clueless about naming products so that normal humans can understand what they are. The XE104 is officially called the XE104 85 Mbps Wall-Plugged Ethernet Switch. That’s like calling a table lamp the LS482 75 Watt Wall-Plugged Switched Illumination Device.

Netgear even makes it hard to find the XE104 on its Web site, netgear.com. It lists it under a section called “Bridges, Access Points, and Range Extenders.” You can buy them at computer stores and other retail outlets.

These adapters are a terrific way to clear up Internet dead spots.

• Email me at mossberg@wsj.com.