Also, you can watch the hour-long PBS documentary about the Stanford and CMU teams in the 2005 DARPA Grand Challenge here:
http://www.pbs.org/wgbh/nova/darpa/. It's really good, and it is interesting to see the very different tacks that each team takes to success.
Edit: I just came across the Red Team's website (they were the ones that came 2nd and 3rd in the 2005 challenge), and it is full of news, pictures, and videos of their progress for the urban challenge, if anyone is interested.
http://www.tartanracing.org/