[Zack Anderson] built this computer controlled autonomous robot (back in 2003) out of an old, ugly powerwheels Jeep. It's got a full onboard computer with wifi, video camera, SONAR sensors, a robotic arm and it can self-navigate. He's provided server and client code (I haven't tried it yet), and The project shouldn't be a surprise, since he's been working on entries for the DARPA challenge for a while.
http://www.hackaday.com/2008/01/25/cesar-geek-out-your-powerwheels/