Some friends of mine at Neighborhood Bike Works have been heavily involved in the North Kensington Kinetic Sculpture Derby and posted some videos on youtube:

Some welding:
http://www.youtube.com/watch?v=9arYxHA1bQI

A very dark Maiden Voyage:
http://www.youtube.com/watch?v=2lDaxPMmOdc

Thought you guys might enjoy it.