At Combots in San Francisco last November I did the autonomous combat competition. A lot of robot competitions have rules for autonomous combat robots, but it doesn't seem like many people make them. It's a bit harder than an RC robot, but I bet there a lot of people here that could make one without difficulty. Anyway, here is some video of the Peanut Tin of Terror and John Frizell's Otto in autonomous combat.
[youtube]Ss4_Mg13WhM[/youtube]
Unfortunately they made the ring really small so the weapons didn't get a chance to spin up. We are going to try again with more room which should be more dramatic. I will try to get video of that, which should be more violent.