CommandROR
Here's something designed for 12v devices:
Juice Bag
Of course it has a bigger surface area than an iLiad cover would have. And look at the price
I think we need to wait for solar technology to reach the next level. The nanotechnologists seem to be making progress.
Wouldn't it be great one day to have an ebook with a little solar cell strip, like a solar powered calculator, as its only power source.