This concept device from Continuum is a dual MP3/CD player with tactile turntables and a full complement of DJ tweaks. While it’s not — and will probably never be — available, it’s a cool marriage of the mechanical and the electronic in a package about as big as your old boombox. However, if you’re looking for something that exists and is available now I just checked out this Mobile DJ MP3 thing that seems to do the trick for considerably less than other kits out there.