Some may have noticed that videogame soundtracks are often better than movie soundtracks. The reasons range from the freedom granted to game composers to the fact that their egos thankfully aren't the size of a small country.
Silent Hill 2
Wow. The first track, Theme Of Laura, is one of the best pieces of music I have ever heard. Most of the tracks where there's a piano involved are equally impressive. Recommended.
Rez
Rez is one of the most innovative games ever made. On its soundtrack you will find a great selection of electronica by the likes of Oval, Ken Ishii and Mist.
Metal Gear Solid 2: Sons of Liberty
For those of you who enjoyed the music of The Rock or Armaggeddon, this comes higly recommended. Again, the first track is amazing. It makes some people euphoric and others cry.
Jet Set Radio
Nifty tracks from various artists are available on this neat import. Features music from the great underground Japanese band Guitar Vader.
Medal of Honor
This might as well have been written by John Williams. One of the best videogame soundtracks ever.
I also recommend the highly unique soundtrack to Headhunter, by Richard Jacques, and the work of Bill Brown, Rainbow Six series composer.