The Sagrillo article you linked to is from 2003. Badly out-of-date, and, of
course, it is published by the industry. Hardly an unbiased source. 

The data they looked at are from a small number of fairly homogeneous sites
in the midwest. There are few studies on mountaintop or coastal sites
(Europe is way ahead of us as to studies of coastal impacts). 

At one time, the industry was very cooperative in that they allowed
researchers access to their sites. That is no longer the case. Therefore,
getting data is very difficult, if not impossible. 

The reality is that the industry knows it has won the PR battle on a
national basis and they seem no longer interested in genuine dialogue and
meaningful analysis of impacts and on ways to minimize those impacts. The
shift from developers who were true greenies whose heart was in it to
ownership by huge utilities may have something to do with it, though some
members of the industry still seem committed to trying to be truly green and
not just raking green. But others are willing and eager to build everywhere,
including sites where no turbines should ever be built, including the Gulf
Coast. It is a real shame. We really need wind energy and the way that some
members of the industry are going about it, they are causing problems for
everyone.

Ellen Paul
Chevy Chase, MD