I have returned from Glastonbury music festival in the U.K, after a tiring 8 days sleeping in a tent in a field. It was all very worthwile though.
Over the 3 day festival, our REchargepod charged 2500 mobile phones from renewable energy, a 500w turbine and 440w of solar. There was a constant queue for the 12 hours we were open per day, one guy waited 4 hours to charge his phone up..
Glastonbury is located in a valley, but a very open space and we would average a 9 m.p.h wind which gave about 150 watts of wind power generally, solar was considerably higher 200-300 watts, but it was June.

The pod took on a new appearance at night, when the bespoke 10 watt LED strip lights and external 5 watt LED spotlights were lit, all powered from renewables.

Further details of the REchargepod on my site
http://www.gotwind.org/orange_recharge_pod.htm
Ben.