I found this site yesterday and thought it was neat. It is the Starcraft Index. It has game info, strategies, utilities, etc., and a list of MP3's.
http://www.scindex.com/dls_listing.php?filetype=mp3s

I haven't listened to all of them but I thought these ones were good
Ghost Dark Rave -- (this one's rather repetitive with the Ghost sounds but is otherwise good )
Half-Life vs Starcraft (not music -- this one's a "battle")
The 12 Days of Christmas -- (same one in Blizzard's Christmas map)
Trance control - Atomic Dance Explosion

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nytfyre m0d || f33l t3h p0w3r || t3h l0st c0gz || OMF > *

I really can't stand the use of game samples in music, it gets annoying.

If you want some great starcraft music, get the brood war intro and radio free zerg off blizzard's website.

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WAITER: Here’s your green salad, sir.
ANAKIN: What? You fool, I told you NO CROUTONS! Aaaaaaargh!