http://www.vgmusic.com/ and get songs from FF VII Kingdom Hearts and/or any game from the x-box ps2 and game cube nintendo series
VGMusic is awesome, but it's all .midis. And they have practically every system that anyone actually cares about. And practically every game.
Yea, the fact that these are just MIDI files is kinda sad.. but I've been going to that site for like 2 years now. Still good, and some MIDIs come dangerously close to sounding like the real thing anyway.
I'm just looking for a site with actual game MP3s.. they're hard to find, but if you search for an individual game you can almost always find them. I have F-Zero GX mp3s saved on my harddrive for when I'm feeling like a techno-geek. :P