I recently spent several hours in a Starbucks in NYC working between meetings. Along the way, I kept one ear out to other conversations and activities.
Maybe I'm a newbie, but it was amazing how much "business" gets done at Starbucks.
Seems to me that this would be a good magazine article for Wired or similar magazine: "A Day in the Life of a Starbucks: business life in the 3rd space."