Bye-Bye Batteries: Radio Waves as a Low-Power Source and Victoria's Circuit
The first article is pretty cool, it decribes a small device that is able to draw power from ambient ubiquitous radio waves. Which is indeed a very clever gadget. You can find that story here: Bye-Bye Batteries: Radio Waves as a Low-Power Source - http://www.nytimes.com/2010/07/18/business/18novel.html?_r=1.
But it also prompted me to remember another article I had read awhile ago. This is another invention that is deriving power from an unlikely source :) - Victoria's Circuit, Harnessing the untapped power of breast motion. - http://www.slate.com/id/2193827