For all those people with those magical things called iPhones and iPod touches, you HAVE to check out Raging Thunder:
http://www.youtube.com/watch?v=YrO65-jperQ
It's available to download from the installer app. It's bloody hard to get used to because you have to steer by tilting the iPod, and you can't slow down so if you get a boost you're almost certain to crash. I'm very impressed with the graphics though.
I stumbled upon it because I was researching openGL and the graphics in the game are generated with it.