I know this might not be the best solution for most, but it's worked great for me...
just get a cheap burner and CD-R's. When you download or rip a friends disc, just back it up on CD-R, quick and easy. Then you can keep your computers hard drive mp3 free and have it all backed up in case of catastrophe. It's not what you are looking for, but it's a cheap solution to backing up before you upload. Better yet, buy a $250 80 gig drive just for mp3's and you're set.
Apologies, i didn't answer the question.. =]
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