I signed up with http://www.lala.com to download the Flaming Lips "Dark Side of the Moon" and it seems like a pretty slick and well stocked site. Anybody have opinions or experience with them? I have an irrational hatred of Apple so don't even say the "i" word! I mean it! 
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Abandoned on Fire
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I never used this one to be honest.
I get my music from http://beatport.com/ and http://www.digital-tunes.net/ usually, but then again that's all for spinning.
Oh, I also love http://bleep.com/