During our discussion of AC power, we digressed a bit into alternate sources of energy to supply the work required to generate electrical power. One interesting idea is to gather the work-energy in urban areas as people walk along specially designed sidewalks.
Sidewalk Power
A number of other creative ideas can be explored on the site from which the above picture was captured.
http://www.popsci.com/futurecity/plan.html
Another site with some relevant information: http://www.core77.com/blog/technology/power_walking_10096.asp
