Audiosurf: Ride Your Music is a game from an independent developer (Invisible Handlebar, LLC) that is gaining some praise from IGF, which I stumbled across some by watching some videos at YouTube (see examples). I am not much of a rhythm gamer but the videos are seducing me to give this one a chance. I like the awesome concept of using your own songs to play through unique levels in the game [value added for my music collection!]. For more details checkout their site and forums and here is demo video set to Kraftwerk - Computer Love.
This may just convince me to use a CD Ripping Service.