yeah! even DJ Chris Kilmore of Incubus uses the MOOG!
Kit is right. hardware gigging in DJing has been around as long as the turntables bit. dualcoil, use these bands as a quick reference that DJing includes a ton of instrumentation NOT limited to decks alone:
Orbital, BT, Crystal Method, Dust Brothers, Justice, Solstice, Underworld, Boom Boom Satellites, Prodigy (a great, great example since Liam tours with a scaled down version of a Nasa command center!), Christopher Lawrence, Telefon Tel Aviv, Grand Poobahs, KMFDM, Erasure, Blaqk Audio...and tons and tons more.