Check out this Cockroach Controlled Mobile Robot (http://www.youtube.com/watch?v=gwZD59Ic9T8) from YouTube (http://www.youtube.com/index)!
LOL! I'm just imagining all those anime shows with people in robotic/mech suits--give a cockroach a bigger chassis and it can join in the fray! :-P
Here's the full description of the project with some cool pics.
http://www.conceptlab.com/roachbot/ (http://www.conceptlab.com/roachbot/)