[Guitar Woman]

Splinter Cell, Half Life, Portal (there are like, two songs, but they're both great), Mischief Makers, Halo, Megaman, Shadow of the Colossus, every Metroid game (well, not 2, but it was just the gameboy), Gunstar Heroes, Killer 7, No More Heroes, Resident Evil, Um Jammer Lammy, Vice City and San Andreas, Silent Hill, ELITE BEAT AGENTS (!), Final Fantasy 6, 7, 8, and to a certain extent, 9, and I also dug most of System Shock's stuff.

I could probably think of a lot more if pressed, but those are all the ones that stick way, way out for me.