Nokia Concept Phone.

This concept phone from Nokia is really quirky, the copper exterior which conducts the heat from your body, or any warm surface and turns that energy and charges the phone! As much as I carry my phone in my back pocket I'd never be without a charge.

http://www.stumbleupon.com/su/1IohFh/inhabitat.com/2010/10/07/nokia-new-concept-phone-lets-you-re-charge-in-your-pocket/