I think you'll find all the chocolate teapot companies are now rapidly back-pedalling as their ludicrous claims have been shot to pieces - 6 months ago, a certain company was claiming that one of their rewound washing machine motors could generate a third of the average home's consumption, in an average town

A couple of weeks ago, we saw the MD of the company admit on Newsnight that the true figure was £10-worth pa in a town! (and I reckon that's highly optimistic!)

I think the bubble has burst at long last - I am no longer fending off innumerable 'phone calls from people wanting the blessed things!

If you still have doubts, get yourself a cheapie weatherstation, and bung the sensors where you were thinking of putting the turbine, and collect some proper data for a few months - at a tenth of the price of a teapot!
For decent chapter and verse, I can't recommend better than the Danish windpower site
http://www.windpower.org/en/tour.htm 
I think you'll find that everyone who actually does know about wind and turbines will tell you exactly the same!