The Biolite may be the coolest backpacking stove ever!
This nifty wood-burning biomass camping stove not only allows you to heat your dinner without carrying around a fuel tank -- it burns the twigs and wood chips you find lying around -- It's also a heat-activated DC generator with USB charger.
A descendent of the efficient "rocket stove" design, BioLite
also makes a larger home version.
(You might compare it to the Solo Stove Wood Burning Backpacking Stove
, which could be considered its immediate commercial predecessor, just without the phone charger.)