From Youtube:

"iDriver is an iPhone application to remote control a car. Go to http://www.spiritofberlin.eu for more information on "Spirit of Berlin", a completely autonomous vehicle by the Freie Universität Berlin. It is equipped with various sensors and a drive-by-wire system for unmanned driving. iDriver is an addon to remote control the car with an iPhone."

There are more iPhone remote control videos at http://www.tuaw.com/2009/10/16/found-footage-iphone-as-remote-control/