In case I do run away from home or even for extended camping trips alone or with my kids it would be wonderful to have a generator that doesn't run on gasoline and the likes.
Is there a way to make a generator that runs on burning wood and how could I make such? It would need a standard wall plug to recharge items like game systems, my iPod and my cell phone. It would be really nice if I could give it a USB port to charge my Garmen (GPS).
It would be perfect if I could make such with items found in nature- trees and discarded waste such as scrap metal, so I wouldn't have to lug around some heavy monstrousity before making a proper camp.

Thanks.