The main tank, brimful with ideas. Enjoy them, discuss them, take them. - Of course, this is also the #1 place for new submissions!
I was thinking you could have something that charges your phone/ipod while you walk. Build a device that you could put in your shoe, or in your purse, or somewhere on you, that could use kinetic energy to charge your stuff.

Reward: This for free. I always forget to charge my electronics...
I had a similar idea which I posted on my site, I think there is definitely potential in this. It would be a small amount of energy, but I bet if you calculated the amount of kinetic energy around the world which could be utilised it would be quite a lot of power! :)
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