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?"
That's pretty cool considering one day you might be able to go to the store and buy a $1.20 drink and fill up your MP3. My only question is how long one 'charge' of sugar lasts. I mean it won't be really useful if you can only run your MP3/PMP/Mobile for 30 minutes on one charge.