I'm not totally sure if a guy's MIT Media Lab graduation thesis counts as 'DIY', but respect to Nikita Pashenkov anyway. He took a bunch of spare parts and built something very like Final Scratch (which has just released Version 2), another playing-mp3s-through-your-decks device. See also: Miss Pinky's Interdimensional Wrecked System, which doesn't rely on weird retro CueCat technology. (Thanks to Tommy Walker III and Waxy.org)
Posted by Tom Whitwell. 
