Keyboard docks ordered today won’t ship until late April (those ordered on April 12 are scheduled to arrive on April 19). And 10W USB power adapters, which let you charge your iPad via electrical outlet, won’t ship until May–nearly a month after the arrival of the iPad itself.

A case of first-come, first-served, I suppose. Still, this gives third-party accessory vendors a nice little sales window free of competition from Apple (AAPL)–assuming they’re ready to take advantage of it.

Dubbed SkyDock, the $119.99 peripheral uses iPhone OS 3′s support for third-party hardware to transform Apple (AAPL) handsets into full-fledged satellite radios. Designed to run off a car’s cigarette power adapter, the SkyDock charges your iPhone while you listen to it. It works in concert with the Sirius/XM iPhone app and supports the ability to tag songs for download from iTunes. Better yet, it gives users access to all XM and”The Best of SIRIUS” channels, even those the company infamously excludes from its online feed, like Howard Stern, MLB Play-by-Play and NFL Play-by-Play.

A wise move for Sirius and one that will no doubt go over quite well with folks who are interested in listening to its programming, but unwilling to pay for a full sat-radio upgrade to do so. No word yet on a firm release date. The device has, however, been granted preliminary approval by the FCC which is still evaluating it.

Below, the official release:

SIRIUS XM RADIO INTRODUCES THE FIRST DEVICE TO RECEIVE LIVE SATELLITE RADIO CONTROLLED BY THE iPOD TOUCH AND iPHONE

XM SkyDock™ allows customers to enjoy live XM and “The Best of SIRIUS” in their vehicles using the iPod touch or iPhone

NEW YORK–August 26, 2009–SIRIUS XM Radio (NASDAQ: SIRI) today introduced XM SkyDock, the first satellite radio controlled by an iPod touch or iPhone. The XM SkyDock is also one of the first products to take advantage of the new hardware control capabilities of iPhone OS 3.0.

Designed for easy use through the existing vehicle audio system, SkyDock has a built-in XM tuner controlled by a free App that users download from the App Store. The App allows control of the XM tuner using the capabilities of the iPod touch or iPhone Multi-Touch user interface. SkyDock will also charge iPod touch and iPhone devices while listening to live satellite radio.

“XM SkyDock will allow millions of users to add live SIRIUS XM Radio capability to their iPod touch or iPhone while in their vehicle,” said Bob Law, Group Vice President and General Manager, After Market Division, SIRIUS XM Radio. “XM SkyDock makes their favorite programming from XM and ‘The Best of SIRIUS’ available to iPod touch and iPhone users anywhere they drive, coast to coast.”

Listeners can use their iPod touch and iPhone to listen to all their favorite sports, talk, news, entertainment and commercial-free music programming, including Oprah Radio, MLB Home Plate, the PGA TOUR Network, Opie & Anthony, Bob Edwards, Jamie Foxx and Blue Collar Comedy. For the first time, subscribers can also listen to the complete “Best of SIRIUS” package, including Howard Stern and his two 24/7 channels, Martha Stewart Living Radio, SIRIUS NASCAR Radio, sports play-by-play and the Playboy Radio channel, all controlled by the iPod touch and iPhone.

Listeners can also tag songs they hear on XM’s music channels for later purchase from the iTunes Store–including songs on XM’s 24/7 artist branded commercial-free channels such as Jimmy Buffett’s Radio Margaritaville, Elvis Radio, Eminem’s Shade 45, The Grateful Dead Channel, B.B. King’s Bluesville, Willie Nelson’s Willie’s Place, Siriusly Sinatra and Bruce Springsteen’s E Street Radio. Other features include game alerts and sports ticker, artist and song alerts as well as a stock ticker.

The XM SkyDock is a perfect companion to the SIRIUS XM Premium Online App, which allows subscribers to receive SIRIUS XM’s Premium Internet service on their iPhone and iPod touch when they are out of the vehicle and on-the-go, at home, or at the office.

XM SkyDock comes with SIRIUS XM’s patent-pending PowerConnect™ technology, which simplifies Do-It-Yourself vehicle installation, working through the existing vehicle radio and making it easy to move from vehicle to vehicle. An Aux In Cable is a standard in-box accessory to facilitate Aux In connections in vehicles with Aux In capability. SkyDock’s flexible stalk optimizes the iPod touch or iPhone placement in the vehicle. Customers can view the touch-screen interface in portrait or landscape modes. Accessories include Magnetic Mount Antenna and spacers to accommodate the various iPod touch and iPhone product generations.

XM SkyDock is compatible with iPod touch (1st generation), iPod touch (2nd generation), iPhone, iPhone 3G and iPhone 3GS. All models require iPhone OS 3.0 or later.

XM SkyDock will be sold in stores and will also be available at www.shop.xmradio.com with an MSRP $119.99 in fall 2009. The XM SkyDock App will be available at the same time.

This device has been granted preliminary approval by the Federal Communications Commission but is still undergoing evaluation by the Commission.

For more information on XM, please visit www.xmradio.com.

Nintendo really should have cut its losses yesterday and cancelled its E3 press conference after Microsoft’s (MSFT) Project Natal demo. How could it possibly have trumped Redmond, Wash.’s controllerless game control system? Certainly not with the Wii Vitality Sensor it showed off today.

The peripheral’s big gaming advancement? It records a user’s vital signs. A nice addition to the Wii Fit, but a far cry from Microsoft’s efforts to turn gamers themselves into controllers.

As I said yesterday, “sucks to be Nintendo.” And today, it most certainly does.

Brand new MySpace CEO Owen Van Natta started things off Monday with his first day on the job. He was joined by new COO and former AOL exec Mike Jones and new chief product officer and former Sling Media exec Jason Hirschhorn. Down in Los Angeles at the AlwaysOn OnHollywood conference, Boomtown ran smack into Huff Post mastermind Arianna Huffington, who extolled the virtues and abilities of new managing editor Jai Singh, former editor-in-chief of CNET Networks. At AOL, in preparation for spinning off the Time Warner (TWX) Online unit, new CEO Tim Armstrong began appointing new senior execs and spinning off existing ones. Platform-A president and former Yahoo (YHOO) sales exec Greg Coleman, who joined the AOL team in February, is leaving the company, to be replaced by Jeff Levick, who is leaving Google (GOOG)–where he had a close relationship with Armstrong. CFO Nisha Kumar is also leaving AOL, and a search is underway for her replacement. MediaMemo has more on Time Warner’s decision to spin off AOL. A number of Flickr engineers were laid off Wednesday, but Chief Architect Cal Henderson has left the company of his own accord and is working on a stealth start-up with Flickr co-founder Stewart Butterfield. Last, but not least, one of the voices covering the digital scene has found a new gig. Owen Thomas, self-described “scourge of [Silicon] Valley,” is leaving Valleywag to head up GE (GE) unit NBC Universal’s new “Bay Area” Web site, whose motto is “Locals Only.” He’ll be replaced by fresh-faced Ryan Tate, recently the night editor for Gawker. Both reporters talked to BoomTown on Friday about the changes.

MediaMemo wrote on Monday about Condé Nast shutting down Portfolio–both the print magazine and the accompanying Web site. On a cautionary note, MM outlined the reasons why Portfolio’s business magazine peers should not celebrate the loss of a competitor, even (or especially) during tough economic times. Is the meteoric ascension of Twitter flattening out? According to a Nielsen Online study, 60 percent of Twitter’s users leave after a month. This was met with a lot of skepticism so Nielsen ran the numbers again with the same results–and this time it’s sticking with them. MediaMemo also had an explanation for why the long-awaited deal between Disney (DIS) and Hulu took months and months and millions of dollars to finally come together. Digital Daily had more on that story.

Digital Daily also had more info on the ever-evolving Palm (PALM) Pre story. First, a rumor that Palm plans to launch the handset on June 7–which would be crazy, given the fact that June 8 is both the first day of Apple’s (AAPL) Worldwide Developers Conference and the day that those in the know expect the next-generation iPhone to drop. Then, there’s an assertion by Collins Stewart analyst Ashok Kumar based on supply chain research that Palm has greatly reduced its production numbers. Time will have to tell, though, because Palm certainly isn’t talking yet. Of course, things could be worse. Dell (DELL) hasn’t even solidified plans for its rumored smartphone, and already, no one really cares.

Dell’s new Adamo laptop and Studio One 19 desktop aren’t causing much excitement either. In this week’s Personal Technology column, Walt Mossberg reports that although both machines look good and function well, neither is groundbreaking. In Mossberg’s Mailbox, Walt answered readers’ questions about improving performance on a PC, using peripheral devices with an iPhone and installing Apple’s OS X on a Windows machine. And in this week’s Mossberg Solution, Katie Boehret tested three apps from the iTunes App Store that make it possible for the iPod touch to function like an iPhone.

More next week.