Check out this awesomely smart idea for powering cell phones and other gadgets with body heat. It also sounds like a slippery slope towards Matrix styled human power plants, which could be a good use for the left over Neocons.
In collaboration with colleagues from the Fraunhofer Institute for Physical Measurement Techniques IPM and the Fraunhofer Institute for Manufacturing Engineering and Applied Materials Research IFAM, research scientists at the Fraunhofer Institute for Integrated Circuits IIS in Erlangen have developed a way of harnessing natural body heat to generate electricity. It works on the principle of thermoelectric generators, TEG for short, made from semiconductor elements. The TEGs extract electrical energy simply from the temperature difference between a hot and a cold environment.