Logitech markets a K750 solar keyboard that charges quickly. By holding it up to my reading lamp for fifteen seconds, it'll hold a charge for over two weeks. I'd love to have a solar track pad that would do the same. Since I don't carry a track pad around, I'd even buy a wired one, so I wouldn't have to change batteries frequently. Eneloop rechargeable or Energizer batteries don't last as long in my MTP as a fifteen second charge of the K750 keyboard.
Wow, that's nifty! Plus numeric pad. Let's see if Apple can beat this.