I doubt there is anything like this - bluetooth is too low-bandwidth to handle video. It was designed for audio and file transfers, which require much lower bandwidth.
However, there are wireless video adapters that work through USB, which could do the same thing you want to do. Here's one: http://www.amazon.com/IOGear-Wireless-USB-2-0-GUW2015VKIT/dp/B001FSMB0S/ref=sr_1_1?ie=UTF8&s=electronics&qid=1275598504&sr=8-1
(I'm not sure if it works with a Mac however).