enRAGEd – A collection of Rage Against the Machine mash-ups and remixes.
I couldn't find this with Google today, then I realized I had the link in an e-mail from the folks at what was formerly boomselection.info. That site is now defunct (or at least orphaned), but has been replaced with boomparty.net. Think less mp3s, more party promotion. Good luck, folks. Now where am I gonna go for my fill of M.I.A. mixes and mashes.