The Linux iPod
Imagine using your iPod and a regular old microphone to record studio-quality audio. Or sitting on a commuter train and playing Othello, Pong, Tetris, or Asteroids. All this and more is possible when you install Linux on your third-generation or earlier iPod. Best of all, one soft reset, and you’re back in Apple’s iPod operating system, listening to your tunes.
This has been around for a while, but this is the best article I have seen on the subject. And honestly, this is just cool.