In the vein of powering electronics, I wonder if anyone has tried to make a kinetically charged power pack. I suppose there's really limited energy gain this way, not enough to charge your phone, camera, light, PLB, GPS, mp3 player, or whatever unless it's a really low drain device (e-reader?). You could have a dynamo with a crank that you use like one of those noise makers that you hold in one hand and swing around. That seems like it'd be easier than using both hands, holding it with one and turning the crank with the other. I've seen flashlights made that way (2 handed cranking), but they were awkward and tiring to use.