Gallipoli… Oxygene! (amongst others)
(sorry)
Also: Wes Anderson movies.
one of my favourites:
Back To The Future (the score, by alan silvestri)
gold 
Magnolia.
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Fight Club!
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Baraka <3
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The Darjeeling Limited OST is great.
“There Will Be Blood” has great eerie droning a-tonal type stuff.
The 2007 movie sunshine by Danny Boyle. The movie didn’t get much attention, but hte soundtrack and even the ambience of the movie all the way through is simply amazing. Absolutely, positively recommended!
The Last Emperor and ofcourse one of my favorites: Merry Christmas mr. Lawrence 
Harry Potter!
The Pillow Book, a Peter Greenaway film with a great oriental soundtrack, and most other Greenaway films (music by Michael Nyman)
Morricone: All the dollars films, Once Upon A Time In The West, The Thing, My Name is Nobody
As mentioned above: anything by Kubrick
As mentioned above: anything by David Lynch
Blade Runner, of course!
AMADEUS 
i second that!
Last of the Mohicans
I loved the music when Wall-E first boarded the space-ship and they were introducing the bustle of robots.
Dazed & Confused
So many more… Three cheers for music in film!
How could I forget - PARIS, TEXAS
Zombieland OST. Various artists. but a great compilation of tracks.
Same goes for The Royal Tenenbaums OST
ah, good call! the “ecstacy of gold scene” is sooo nice =D
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@annide: yeh, royal tenenbaums has got some nice tracks!