Here is an interesting creation using Mindstorms NXT, a Rolling-Orbital-Bluetooth-Operating-Thing (ROBOT) as its creator calls it.
Spherical Robot 02 (YouTube)
This project uses two NXT controllers: one inside the “thing” and an external one that acts as the remote control. The two controllers communicate via Bluetooth. The external controller is also uses NXT motors that are very cleverly . . . → Read More: A Remote-Controlled Ball? It's A Spherical-Robot Based On Mindstorms NXT