http://www.waze.com/guided_tour/
Neat idea in GPS - track people's phones' GPS locations and use that data to construct road maps, then use their current speed to determine where traffic jams are and show that to other drivers.
Found through Real Life Comics, where they expound upon the possible downside to drivers' spouses: http://www.reallifecomics.com/archive/111223.html
http://forums.righteouswrath.com/index.php/topic,8147.0.html
lol I thought it sounded familliar
d'oh!