I only have a few MP3s, but my favourite soundtracks (in no order) are (and favourite song)...
Halo - That really calm tune that is played in the main menu randomly. If that is on the actual soundtrack, somebody send me the MP3 file pleeeeease!
Hunter: The Reckoning - Terrabola (kick arse scary/action music. If anybody has the main title theme of this game, please send =D )
Diablo 2 - Tristram (beutiful music)
Deus Ex - Paris Chateu (again, beutiful)
and more that I canne be bothered to list
