Although we at TMRW are not introverts ourselves, we have teamed up with a lot of them through the years. Yielding al kinds of results (as one might expect from a different group of people).
One thing we always have enjoyed is getting people to shrug off their shells and delve into a project. We that joy of a project hits you, we are all introverts as well as extraverts. Maybe it isn't about being one or the other but committing to something whilst talking and listening.
Enought with the 'thinking-while-typing. We are sure you would rather hear from the good people at IDEO.