I checked out the book, Quiet: the Power on Introverts by Susan Cain from the library. It was a very good read, but unfortunately I had to skim the last half to return it before the due date. The author has a good TED talk on the subject that I enjoyed. Since there seems to be a fair amount of self-confessed introverts on the forum, I thought a few might be interested in giving it a listen.
http://www.ted.com/talks/susan_cain_...ntroverts.html