Oh god, I've been in love with video game music since a kid playing Sonic the Hedgehog in on my neighbor's Genesis. Speaking of which, OCRemix has an album out from that game for its 20th anniversary: http://sos.ocremix.org/
Here's a partial list of some of my favorite video game music: Sonic 1, 2, and 3. Megaman 2. C&C Red Alert 2 and 3 and C&C Generals. Halo. Alan Wake had a pretty great soundtrack. Kind of brain farting right now, but needless to say <3 video game music.