Valdis Krebs has taken the ideas of connectors and mavens as described in Malcolm Gladwell's book, The Tipping Point, and measured and mapped them for a smallish geographic area, northern Ohio. What he's measured is connections among bloggers and innovators, both separately, and who's in both networks.
Amusingly enough, the first comment he got was from the most connected connector he measured. Who remarked that he had deliberately tried to build his network of connections this way. Reality imitates art?
I think it would be even more interesting if these connector maps were updated regularly, and animated to show changes over time.