Which is why I'm particularly interested in the Ray from Quirky. It's a solar charger for devices that use a USB connection - which has been done before - but what separates Ray from other solar chargers is an integrated suction cup that allows it to be affixed to a window or windshield
so that it can collect solar energy without actually being outdoors, or having to constantly fiddle with its stand (which is also included, in case a convenient window isn't handy. On top of that nifty innovation, the price is certainly right: $49.99 at MSRP, but only $39.99 if you commit to buy it through the current presale.
[Ray: Recharge Naturally, from Quirky, $39.99 on presale.]