The same day as my post below, I emailed a letter to the editor at the New York Times, and it was published today along with several other letters critical of Susan Cain’s article:
http://www.nytimes.com/2012/01/19/opinion/the-key-to-creativity-solitude-or-teams.html
The Creativity Guru 
Good job, Keith!
Great letter. The other letters were good too. Extremists always get the attention because they have an extremely passionate audience at whatever end of the spectrum they are at.
Thank you both! My blog hits are way up, so it seems this has resonated with many people.