Touchgrind by Illusion Labs is an awesome finger boarding game for your iPod. There are 3 different game modes: Warm Up, Jam Session, and Competition. In the competitions you have a set time limit to try to get a high score and unlock new boards. In jam session you do tricks to try to earn a high score like in competition. The difference is that you can't unlock new boards and you don't have a time limit. In warm up mode you can practice all of your stunts. You just don't get awarded any points for them.