Oh noes, I'm addicted not only to Discovery! I'm hooked on Audiosurf as well!
But, seriously, that game is fun! It's entertaining and the music does always fit - since that's what it's about: you ride your music.
Sounds strange, I know... basically, you choose a song and the program generates an abstract highway track from it. On the track you have to collect colour blocks to form patterns in order to get points. Depending on the song, the highway is taking you slow and steady uphill (slow, acoustic songs) or it's bumpy, fast and difficult (electronic songs with fast beat).
Does anybody of you know the game? (you can check it out under www.audio-surf.com . it requires Steam though)
I bought it pre-release, and as soon as it was released played it a few times.
It's decent, but it's not my style of game and doesn't keep me very interested, let alone addicted.