If you picked up Nine Inch Nails'Year Zero remix album, 1337-ly titled Y34RZ3r0r3m1x3d, you probably noticed the second disc "halo 25 data," containing the multitrack master files for every song from Year Zero. Some of them had already been posted online not long after its initial release, and that experiment's success led to the full-blown version. It's obviously meant to spur fan remixes, with the last piece in the puzzle being an official site to organize and distribute them all.
Thanks to Universal's legal wrangling with YouTube, it's not going to happen. Update: Trent's hosting the remix site himself. From nin.com, "Sometimes you just have to say... 'fuck it.' The remix site is UP! Have fun."
The gist of all the suits against YouTube is that, because it doesn't pro-actively take down or automatically block copyrighted content, it effectively doesn't fall under the DMCA's safe harbor provisions. If Universal, Trent's former record label, hosts a site where a fan pulls a Danger Mouse with Year Zero and Prince's 1999, which Universal doesn't own, they think they'll be opening themselves to the same blasts they're pelting YouTube with. Then their lawsuit would be in jeopardy, and you can't have that.