YouTube user ecodeasnet recorded a man in a town in Nepal driving a modified rickshaw. It had a steel drum that had been shaped to catch the wind and channel that power into the wheels. I'm a bit skeptical of its effectiveness, given the weight of what appears to be quite thick sheet metal. What do you think?
http://www.automotto.org/entry/wind-driven-rickshaw-is-a-wind-human-hybrid-vehicle/ via DudeCraft