Well, ive had this on my mind for a few weeks now

http://ghosts.nin.com/main/order_options

nine inch nails have released a 4 cd set, the first of which you can download for free, from their site (see above link)
this is another of the free legal downloads, im getting it right now, purely cos I want to mess about with it and create some nice remixes (they released it under a creative commons – share and muck about with type license)