Brock had a post up about Rucksack Battery Charging Systems last night and I commented on some systems I have been researching for camping, etc. Anyway he put my comment up as a post and I thought I would share the information here.
I have a solar charger that will fully charge in about four hours of sunlight and will retain enough power to charge a cell phone twice. I also have a LED light I can plug into it for some major light if needed. Although it will not charge AA and AAA's it is still a handy device. I have been looking at the thermo generation systems that are powered by a campfire, stove, etc. There are several models available, but this is the one I am leaning towards based on reviews, weight, and function. They can be found a little cheaper on Ebay, etc.