Darpa Road Challenge video for self-guided cars. This one was in the desert (highly entertaining) and the next one is in November 2007, which will be in an urban environment with other live moving vehicles.

There is also a pretty decent NOVA episode about it. It's available here on Google video: http://video.google.com/videoplay?docid=6332465736056532482. Unfortunately you have to pay for it there. You might be able to catch it on TV sometime though. -- David W.