Check this video, from the Make blog, especially for Rik.
I want one. And I got the same drill motors used, I think.
Hope this is a good place for this. Think the videos require Realplayer or another program that can do rm files. Is anybody interested in competitions? This is an annual minisumo competition seen on a mailing list :
Check out this : http://www.youtube.com/watch?v=o7zRJyK66I0
Links to here : http://craftsmanshipmuseum.com/