We've come across plenty of robots that were controlled by phones before, but usually those phones were being controlled by human hands. Some California hackers, however, are building bots that put Android to work for their robo-brainpower.
Their first creation, the TruckBot, uses a HTC G1 as a brain and has a chassis that they made for $US30 in parts. It's not too advanced yet—it can use the phone's compass to head in a particular direction—but they're working on incorporating the bot more fully with the phone and the Android software. Some ideas they're kicking around that wouldn't be possible with a dinky Arduino brain: face and voice recognition and location awareness.
If you're interested in putting together a Cellbot of your own—can you even conceive of a cooler dock for your Android phone?—the team's development blog has some more information. The possibilities here are manifold; mad scientists, feel free to share your Android-bot schemes in the comments. [Wired]