The best conceived, best designed, best manufactured, best installed, best maintained, and best operated wireless solution is almost as good as a cable.
I haven't seen any wireless USB connections either, except for the typical w/l keyboard or mouse that has a receiver connected to a USB port. The smartboard is essentially acting as a big mouse, so maybe some clever engineering or comp. sci. student can figure out a way to graft parts of a wireless mouse to the smartboard and turn it into a big wireless mouse-equivalent. Don't hold your breath.
Keith D. Mills
Manager, Classroom Services
University of Calgary
MLB 26, 2500 University Drive, NW
Calgary, Alberta, Canada T2N 1N4
Ph. (403)-220-6386 Fax. (403)-282-4497