Nice 3-part series by Low-tech Magazine: http://www.lowtechmagazine.com/2011/05/history-of-pedal-powered-machines.html http://www.lowtechmagazine.com/2011/05/bike-powered-electricity-generators.html http://www.lowtechmagazine.com/2011/05/pedal-powered-farms-and-factories.html - Bert -