In my opinion, music can make or break a movie. It can help drive a dramatic scene home and gives us another way to interpret the environment exposed to us through film. Some soundtracks do also make excellent albums on their own.
Quite simply, what movies/TV shows have spawned your favorite soundtracks? Mine are:
Amadeus
A Clockwork Orange
Star Wars
The Lord Of The Rings
The Godfather
The Animatrix
Beyond The Sea
Requiem For A Dream
soundtracks? there can be only one:
This is [size=167]Spinal Tap[/size]
-Imp
Blade Runner
2001: A Space Odyssey (probably the winner)
Dunamis
I heart huckabees
well… anything by jon brion really.
I liked the one in Eyes Wide Shut
Three Kubrick movies nominated.
Dunamis
im not one for soundtracks, but …
royal tenenbaums
Pirates of the Carribean
…ditto
Spirit Wind by David Arkenstone
Pulp Fiction
Mean Streets
Full Metal Jacket
The Last Broadcast
mission impossible
star wars
bourne identity/supremacy
wayne’s world
A couple of my favorites, both by the same composer, are the soundtracks to Road to Perdition and Meet Joe Black. The latter was a really boring film, but I liked the music. Danny Elfman’s soundtracks usually appeal to me a lot as well. I especially liked the orchestral scores of Sleepy Hollow.
I’m not really a huge fan of ‘soul music,’ but the soundtrack to The Committments really works, at least in context with the film.
the red violin
and
running on empty
Yes, another good one. I think most of the solo violin work is by Joshua Bell.
I hear soundtracks here and there but I don’t remember them. I do own the one from “Get Shorty” and I like it. Its an entertaining combination of jazz styles mostly.
oh yeah sleepy hollow is good
I could name i few, but they would be dwarfed by the (i cant believe nobody has mentioned it 
) monstrous size, the vast scale and distance it dwarfs all those opposed to it, the unreachable emotion it brings when you think back to a clip of the film, the ability it had to literally make a whole epic and not just a film; all this was despite the terrible lead acting of Stallone. THE MONTAGE MUSIC OF ALL MONTAGE MUSIC: [size=59]Rocky[/size]
so nobody else has to copy-paste that into word to read it, it says “rocky”
My favorite soundtracks:
Moulin Rouge
Baseketball
Star Wars
Resident Evil
Crash
Cowboy Bebop
Escaflowne
I hated the soundtrack to the first Resident Evil movie, although I loved the film itself (marry me, Milla- pretty please! 
). The music for the second one was a lot better, though, IMOHO.
I thought that Milla was married to Luc Besson…