www.TheDoItYourselfWorld.com

Was Browsing the web and these caught my eye
http://www.biolitestove.com/about/our-story/team/" onclick="window.open(this.href);return false;
BioLite CampStove & BioLite HomeStove



Should be useful due you can charge up USB Battery packs so can Recharge your phone / GPS / Handheld Ham Radio

I have been interested in these for a while now. The price is way too expensive for most people though. I may one day try to make my own version of such a stove. All you need is a peltier element and some huge heat sinks to take the heat away. Make one side hot and the other cold and it produces power.

But in all my studies these things do not produce very much useful power at all. Would probably take a long time to charge your cell phone for example.