Cool, I thought this was a duplicate post, but that was Pop Science recently. Here are the links:
popular mechanics - My library - Google Books
Regarding that windmill... we had a discussion on personal windmills a while back. The commercial ones produced so little actual power that the payback (even after govt credits) was probably negative. Maybe a DIY model can be made cheaply enough, but the problem is that winds at ground and rooftop levels just are not high enough enough of the time to generate much power.
There is a reason that most of the commercial units are 300' tall!
edit - what issue was that article? I found lots of hits on windmill going back to the 20's!