This is TOO COOL…a new solar device called The Window Socket, allows you to charge and operate small devices (at the moment) from its solar panel. It has a suction cup and attaches to any window (how cool is this?).
AND the charger stores energy! According to the info I found, after 5-8 hrs of charging, the Window Socket will provide TEN HOURS OF JUICE to charge a phone, for example, even in a dark room!
Caveat: this device is not yet available here in the US, but keep an eye out for it!
For more information, check it out at http://www.yankodesign.com/2013/04/26/plug-it-on-the-window/