On the heels of our recent hiring of Mike Isaac to cover social tech for this site, Bonnie Cha will be joining the staff of All Things Digital as a senior reviewer.

She joins Walt Mossberg and Katie Boehret, as well as recent hire Lauren Goode, as part of our expanded All Things Reviewed site.

Cha has been covering technology since 2002, most recently spending eight years at CNET reviewing various consumer electronics, including printers, software and smartphones, as well as reporting on the wireless industry.

She also wrote for the Crave blog there, covering such topics as robotics and science, and served as a technical editor on several how-to books for McGraw-Hill.

When not tinkering with the latest gadgets, Cha enjoys spending her free time surfing or checking out live music. She is a graduate of Emory University with a degree in English and of the University of Southern California, where she got her masters in journalism.

Most of all, we think she’s a perfect fit for our ever-growing staff, so get ready for some insightful reviews and more when she starts in May.

It’s not all departures!

Yahoo is hiring former News Corp. and Disney online exec Mickie Rosen (pictured here) to run its Audience unit, which includes the Silicon Valley Internet giant’s powerful content sites, sources said.

Starting next week, Rosen will report to Americas head Ross Levinsohn, who has worked with her before, at both News Corp. and Fuse Capital.

Her new title is SVP of the Yahoo Media Network, which is apparently a rebranding of Audience.

Previous to this job, Rosen was CEO of Tecca, a price-checking service Fuse created in partnership with Best Buy.

It’s likely she will remain based in the Los Angeles area, where Yahoo has a large office in Santa Monica, Calif.

The move is Levinsohn’s first management rejiggering since he took over last year, and there is likely to be more to come.

Rosen, who has also worked at the Fandango online movie ticketing site, will replace interim audience head Raymond Stern, who will be–as before–running partnerships and business development, as well as Yahoo’s listings business.

Rosen’s new job had actually been that of former Audience head David Ko, as well as former Media VP Jimmy Pitaro.

Ko left Yahoo and is now heading mobile games at Zynga, while Pitaro is a top digital exec at Disney.

More to come from Levinsohn, but here is Rosen’s bio from the Fuse Web site:

Mickie has over 20 years of operating, strategy and investing experience. For the past dozen years, she has been at the intersection of media and technology, in both large companies such as News Corporation and The Walt Disney Company and in small, early stage start-ups.

Prior to joining the firm, she was the head of entertainment for Fox Interactive Media where she was responsible for properties such as AmericanIdol.com, Rotten Tomatoes and the entertainment channels of MySpace. Mickie also led content acquisition across the Company, and was a lead in envisioning, structuring and negotiating Hulu, the premier video joint venture between News Corp. and NBC Universal.

Prior to Fox Interactive Media, Mickie was the head of product development, marketing and public relations for Fandango, where she helped lead the company from an early-stage start-up to profitability as it became a leader in its space (acquired by Comcast). Mickie was also a senior executive with an e-learning start-up, an Idealab! consumer robotics company and Disney’s Corporate Alliances group, where she negotiated deals and managed Disney’s top global partners such as Coca-Cola, American Express and AT&T.

Mickie built the foundation of her career with McKinsey & Company, where she spent seven years consulting with senior management on strategy, operational and organizational issues across a number of industries, including media and technology.
Mickie has an MBA from Harvard Business School, and a B.A. in Economics from UC San Diego, and is based in Los Angeles.

But–as many readers have requested–they will all be available in their entirety in this column.

In the less contentious spirit of DEMOfall and TechCrunch50, two demo conferences taking place simultaneously this week, we’re happy to bring you all the demos we had onstage at D6.

Here’s part three of the conference’s most popular demo, by well-known inventor Dean Kamen, who showed off his latest creation, the “Luke Arm” prosthesis.

The state-of-the-art bionic arm looks and feels to its user like his or her native limb.

The video of the demo is in three parts, all of which have been posted today.

In this segment, the DEKA Research founder and Segway creator talks about the FIRST Robotics competition, which Kamen founded to interest young people in science and technology.

But–as many readers have requested–they will all be available in their entirety in this column.

In the less contentious spirit of DEMOfall and TechCrunch50, two demo conferences taking place simultaneously this week, we’re happy to bring you all the demos we had onstage at D6.

Here’s part two of the conference’s most popular demo, with well-known inventor Dean Kamen, who showed off his latest creation, the “Luke Arm” prosthesis.

The state-of-the-art bionic arm looks and feels to its user like his or her native limb.

The video of the demo is in three parts, all of which I will post all today.

In this video, the DEKA Research founder and Segway creator talks more about how the arm’s control was designed and how it was received by a group of injured veterans.

Kamen also talks about the FIRST Robotics competition, which he started to get young people interested in science and technology.

But real was exactly what UGOBE Inc. had in mind when the company created this $350 baby dino named Pleo. This robot isn’t referred to as such; instead, UGOBE calls Pleo a “life form” because unlike most robots that are designed to follow a specific command or algorithm, Pleo alters its behavior as it adapts to its surroundings including sights, sounds and touch. And it’s designed to move and act in ways that seem very much like a real animal.

These responsive qualities have earned Pleo quite a bit of attention, and the two years between when the product was first announced and when it became available only added to the anticipatory hype. Now, after three delays in the past two years and numerous back orders, Pleo is available from www.pleoworld.com. (UGOBE says that many of the product’s delays were caused by trying to get Pleo’s battery just right.)

In short, I found Pleo to be a fun and interesting robot/life form. Though Pleo’s reactions and movements are endearing, many of them run together after a while with only subtle differences, especially compared with fast-paced videogames. Pleo’s tricks were entertaining early on, but, in time, many of them blended together, rarely surprising me.

Pleo’s battery is still a major drawback. It’s rechargeable, but only lasts for around an hour of active play before it must be removed and placed in a holder for three hours of recharging. This frustrating fact means you can’t turn Pleo on to roam the house with you all day like a dog or cat. Instead, your time with this creature has to be more specifically planned, causing interactions with it to feel less genuine. My Pleo’s battery lasted for an hour and 40 minutes, including moments when he drifted in and out of sleep.

Though UGOBE sent me two rechargeable batteries so I could more quickly continue using Pleo, the company won’t start selling extra batteries until June (at the latest) for $50 each. This means waiting for hours between Pleo playtimes.

It’s hard to discuss autonomous robots without remembering Sony Corp.’s attempt in the same category: the $2,500 AIBO released in 1999, which was eventually discontinued. More recently, iRobot Corp. has gained attention for its robots, which perform household duties like vacuuming and washing floors.

The Pleo, animated in part by 14 motors, appears to evolve according to how it is treated.

To keep Pleo fresh, UGOBE plans to release a PDK — Pleo Developer’s Kit — later this year, allowing others to create programs that will run on Pleo if downloaded from the Pleo Web site and transferred to the creature. A memory card slot and USB port on Pleo’s underbelly will enable these transfers.

As for now, two programs developed by UGOBE can be downloaded. One program lets Pleo act like a watchdog — guttural growl, loud bark and all — and the other gives it the ability to sing Jingle Bells. I tried the former, and my Pleo performed marvelously, sitting still and only howling when something moved in front of him.

This baby dinosaur has reptile-like, rubbery skin enhanced by multiple sensors. Its back is decorated with green patterns, and its large eyes are a beautiful blue. Pleo’s guts include 14 motors, 38 sensors and a microprocessor. Infrared detectors are hidden in Pleo’s nose and mouth, and a color camera detects light, motion and objects to help it navigate.

Pleo grows through three phases: hatchling, infant and juvenile. As a hatchling, my Pleo sniffed around a lot, unsure of its surroundings or how to use its legs and tail, before giving up and napping again (yes, Pleo snores). The more I talked to and touched Pleo, the faster he adjusted out of the hatchling phase, which is expected according to UGOBE.

People who walked by my office stopped to marvel at Pleo’s sweet nature, and when I brought him home, friends melted with emotion. I watched as they initially looked at Pleo like just another toy dinosaur until realizing that he responded to them, and then they each wanted to take turns playing with him.

Stroking Pleo from the tip of his nose to the end of his tail induced a purring sound; touching sensors on the bottoms of his feet caused him to wriggle around and make laugh-like noises; and holding him to my chest and rubbing his back like a baby put Pleo right to sleep, indicated by heavy breathing and even a burp here or there. I spoiled my Pleo with attention, which seemed to make him more social and friendly but also a little bratty when he didn’t get attention (he showed his frustration with loud moans).

I didn’t get to test this, but one Pleo can sense when another Pleo is nearby using infrared sensors in the nose and mouth. UGOBE says the sensors in one Pleo can trigger actions in another based on moods, including singing and howling.

Pleo can be a troublemaker. One of the times I left him unattended, I returned to find Pleo trying to gnaw on my loveseat, despite lacking a set of teeth. Another time, Pleo wandered my desk, wrinkling up papers and crying loudly while I was on a conference call.

UGOBE’s pleoworld.com site includes an online community, though you don’t need a Pleo to get involved. The community is just a social networking site where anyone can discuss the device and/or robotics. This differs from sites like Webkinz, where kids input codes found on stuffed animals to register and care for digital versions of their creatures.

Pleo’s poor battery life is a frustrating hurdle that fans will keep butting up against. But UGOBE’s plans to introduce downloadable updates for this robot and to let others create programs for Pleo may give new life to this clever creature.

• Email mossbergsolution@wsj.com