I were at one event in Finland with 3 of my robots this weekend, really liked it, will be likely going agen some time in the future. I started thinking that drums on walkers may be a good idea! :P
One of the vids: my disc walker Spin vs. overhead spinner!
http://www.youtube.com/watch?v=olGn7A9w4Ek&feature=related

Also one vid of the 150g fight.
http://www.youtube.com/watch?v=QcJy6v5HtZk&feature=channel_video_title
http://www.youtube.com/mk2wonder has all the fights (where i lost ) if you want to see!