Here's an interesting concept that is gaining traction with the military now and could potentially impact consumer products down the line. It's a video of a backpack with a specially designed frame that collects energy as we walk. It then stores the energy up so it can be used to power our gadgets, like sat phones, iPods, and other technology. Seems like it has lots of promise. Of course, it'll have to become affordable too. That's the real trick!