shynet and his friend made the nBot as a school project. The nBot is a moving robot that shoots a laser - the laser hits the opponent team laser detecting sensor (which is a small system attached to an Light Dependent Resistor - LDR). On each hit the opponent robot sends a hit signal to the main server, then the main server calculates the remaining life points of that robot by taking the attacking robot weapon damage.
For a school project the result is amazing and we wouldn't mind having a battle or two ourselves, but that's not all, the recent addition to the project is control via a Nokia phone using its accelerometer.
For more info you can check here and here and a video demonstarting the accelerometer control can be found here.