Audiosurf

Really awesome little game that creates a racetrack based on your MP3s.

It examines a song and makes a rising/falling/twisting track that you fly down. You collect color blocks and get points.



From 1up.com:

Color-matching squares on a grid by colliding with (also music-synched) traffic makes Audiosurf feel like an odd combination of Wipeout and Klax. It's more than fun enough, and it gives you a goal to shoot for. Hell, there's even some pride to be earned by becoming the best player in the world (or the only player) at Frank Zappa's "Dinah-Moe-Hum." That isn't to say that this is just another visualizer, though -- not by a long shot -- but the real joy here is in getting a dynamic interactive light show and something to do with your hands while you listen to your favorite records.