Wow. This is coolest of the cool. All ye people living in US of A must've heard of Robosapien toy. There's a Version 2 of it, called Robosapien V2. It's awesome in every count. You read this article, you'll agree.
I remember reading about it's creator in Reader's Digest long back. He built a swarm of robots solely out of ripped-out old Walkmans and if I remember right, a robot to remove mines too. And you know what? He observed this interesting phenomenon: All these, independent, sensor-roaming robots, tend to get together whenever they're deployed like a swarm. Isn't that spooky?
Check this out: