I coach a FIRST robotics team, that I was on in HS. We design and build robots in 6weeks for an international competition. We've got our 'bot up and running two weeks early, here's a video of it driving with Mecanum wheels and kicking a soccer ball around (part of the game):
http://www.youtube.com/watch?v=quV24Sx0zpk
http://www.youtube.com/watch?v=quV24Sx0zpk