One of my favorite games that I've played since I picked up the iPhone has got to be Cube Runner. It is a very simple game in which you use the accelerometer to control a ship and navigate through a series of blocks.

There's really very little to this addictive game. One thing I will note is that when you start up the game, definitely tap on the little “i” in the bottom right corner. This will flip the game into horizontal mode, which makes the game a lot more fun to play.

There are three levels of difficulty, and with ever-changing levels there is enough replayability to keep you entertained for some time. Cube Runner is only going to take up 0.1MB of storage space and is free.