Stupid Advert

I advise you to be wary of adverts for making your own energy (usually for <$100).  For example
http://makinghomeenergy.com/ - appears to be stupid, waste of time etc. whereas
http://www.thekevdog.com/projects/wind_generator/ - appear to be useful, contain information, etc.

Everyone seems to be using DC motors though, which I find a bit disappointing... it does make life easier though.