Let the hive mind of Engadget get that for you.
"I'm looking for a wireless trackpad to use with my older (2.5 or so years old) C2D MacBook that's perpetually docked to my home theater. Something sleek, thin, not too small, made of high quality materials. Ideally, it would natively support all of (Snow) Leopard's multitouch inputs, and even more ideally, it would have a charging dock / base. The only problem is that I'm not sure that such a thing even exists. Think you can throw me a bone?"
Not that I would do this myself, far from it, but I've been on the odd shoot where we have shot 48-sheet billboards with a 5D. Pretty dodgy, I know, but not many clients can tell the difference with a bit of quality post production factored in.