Just want to throw in my invention:
http://video.google.com/videoplay?do...62206188893168
it is basically an air compressor winding-up or charging, crank or wind-up motors that toggle and spin electric motors. the air compressor can be initialized by "human energy" like a
crank up radio except cranking up a pump for the air compressor.
also please bare in mind I did the video on the first take so it may be a little weird I plan on revising soon.
another interesting find is a cool solar charger I noticed:
http://www.solio.com
an awesome site with lots of stuff is
http://www.campingsurvival.com/
Thats my 2 cents!