At Quest Studios you can download a bunch of complete soundtracks from some old games. (Mostly midi, but some mp3 & ogg too).
Betrayal at Krondor was the only one I played enough to still recognize some of the music. Strange to hear it again. Game music sure has come a long way.
edit:
Here's a page with music from Final Fantasy X in midi form... it's not very nice to listen to, but it's sort of cool to be able to drop the pieces into your sequencer and see what's going on in them.
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