The Singingfish search engine
which indexes audio and video files on the web has been in the news this
week.
Amongst the interesting items I found through it are:
Preserving Windmills on the Prairie - audio - a 1999 report by
Leif Enger and Minnesota Public Radio, providing a general intro to
American windpumps, including some history of the Aermotor company.
Cape Cod Windmills - audio - a 2002 NPR report on the proposed
offshore windfarm in the waters near Cape Cod.