RobotTaxi?

How about a race car where pilots would be robots? Nice idea but still a dream?
Well, no. Last week was the 3rd edition of the Darpa Urban Challenge, featuring robot driven car developed by highest University like Stanford. Quite amazing! [source article: NY Times]
So soon a service where on your telephone you can order a cab that would drive you, securely, where you want, 24/7 and... no tip?
Or, simply the smartest GPS?
Or, for me, just allowing me to go to the back seat with the kids and watch a movie with them ;-)
... and all tickets would go to... the robot!