One of my favorite racing games for iPhone / iPod touch is GTS World Racing from Handmark and Astraware. If you haven't loaded this fun app on your pocket pal, you might want to race over to the App Store before October 19th since GTS World Racing is on sale (click opens iTunes) for $2.99.
This action-filled race game features a number of different cars, countries, and tracks, and uses the accelerometer to control the speed and direction of the car. It's a much more realistic racing game than Crash Bandicoot Nitro Kart 3D or Cro-Mag Rally
For more info about the app, including a movie showing the game in action, check out our August preview of GTS World Racing.