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Audiosurf
Weird little game this. Like a mix of Tetris and Guitar Hero - you essentially run along a track with little coloured blocks dotted about. Collect three or more blocks of the same colour together to get points. Interesting part: The speed intensity of the track - essentially the difficulty of the game - is based purely on what music you load into the same, which alters things based on the rhythm and such of the song.
I just played a level based on Radiohead's All I Need.
When I feel confident enough: Meshuggah. Fuck yeah.
I'll let you know how it goes.