As you may know, I love solar powered gadgets, so the Eton Mobius is right up my alley. The Eton Mobius is a battery pack, case, and solar charger all in one. Strap this solar case on your iPhone 4 and you get double the power from the additional battery plus the rear mounted solar panel.
Still waiting for price and availability, but I am in line waiting.
Awesome! I want one!