Sun
Trekking through the desert? Camping on the beach? With its solar-voltaic cells, the waterproof loos Orange can power up to four handheld devices on a single charge. $100; solarjoos.com
Wind
Like a palm-size power station, the HYmini can attach to your bike's handlebars to generate and store energy with as little as 9 mph of breeze. $50; hymini.com
Magnets
After juicing the built-in battery via standard AC, the Powermat Portable 2x Wireless travel charget uses magnetic induction to activate your iPhone, BlackBerry, or Nintendo DS on the fly. $100; powermat.com
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