I just stumbled across this and figure I need to build it. Not only would I learn something but having just traveled all over the place with my Android tablet I can imagine a USB solar charger being very handy. Of course it's winter and here in Bellingham the sky is pretty much 95% rain between 100% rain.
Nevertheless, I am adding this to my to-do list.
http://www.instructables.com/id/Solar-Altoids-USB-Charger/
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