The WiMo robots are breeding. There are now three of them. WiMo is the Windows Mobile Robot created by Brian of the Windows Mobile Team. WiMo uses a Windows Mobile 5.0 Smartphone as the central “brain” for the robot. The Smartphone communicates to a microcontroller via Bluetooth and also communicates with a Pocket PC via WiFi. The Pocket PC can be used to remotely control WiMo.
Brian posted the lower-level source code, notes, and photos of the process for his WiMo robot on his WiMo web site. As far as I can tell, you don’t need Microsoft’s new Robotics Studio to build WiMo.