Canabalt

This is probably one of the coolest games I've seen available for a phone. The aim of the game is to run as far as you can before dying by jumping over obstacles and from building to building. The music combined with the visual style and the simpleness of it all makes this such an addictive game. It’s available for the iPhone and only in the US store but you can play a demo on their website. Note, to jump just click the mouse button. [Link]