A New Renewable Energy Source: Generating Electricity from Vibrations
Here’s a potential source of electricity to help Wal-Mart (WMT) achieve its goal of using 100 percent renewable energy in its stores: its customers. Each step a person takes produces 64 watts of dissipated energy and scientists at Australia’s Commonwealth Scientific and Industrial Research Organisation are developing technology to “harvest” vibrational energy and feed it to the power grid or store it in batteries.
http://blogs.business2.com/greenwombat/2006/11/a_new_renewable.html