The winner of the Doritos competition, Dash of Destruction, is now available for download free on the Xbox LIVE Arcade, weighing in at 60MB.
The game has you dashing your way through the city as a hungry T-Rex in search of the Doritos delivery truck tracks you down. You must make the drop-off points. The game is single-player, but features leaderboards so you can make sure your score is the highest.
Dash of Destruction [Xbox LIVE Marketplace]