Anything by Thomas Newman:
American Beauty, Finding Nemo, The Green Mile, Road To Perdition...
Oh indeedy.
SCORES:
No one mentioned 28 Days Later, I don't think. John Murphy can assemble a fine, fine soundtrack.
Vangelis - Blade Runner. A fantastic movie improved by a perfect soundtrack. Ambrosia.
Apocalypse Now - Nothing like creepy synth music to make going down the river chilling.
Ghost Dog had a perfect soundtrack as well. Minimalist hip-hop is awesome stuff.
Dawn of the Dead. Original, I mean. The Goblins. What can I say? Synths are creepy.
Certain games have really amazing soundtracks. Hitman, Freedom Fighters (incidentally, both by iO interactive). Half-Life 1 and 2 used great incidental kicks, as did Shock2 (though that relied more on sound design in general instead of mere score). Tomb Raider: Legend has an *amazing* soundtrack (The game sucks, though). And who can forget the pounding tribal war drums of Mechwarrior 2?
SOUNDTRACKS:
I second the nominations for Trainspotting and Snatch.
Wipeout XL stands as one of the best licensed game soundtracks ever. And the first, incidentally.