Reality Mining

Good designers and campus planner already do some version of this, but this Wired magazine article discusses how those who study organizations track face to face interactions:

Waber, a PhD student in MIT's Human Dynamics Group, studies the way groups interact socially — based on who's talking to whom. But unlike most social scientists, who simply ask people about their behavior, Waber and his colleagues measure it. They outfit employees with special badges that work with base stations to log all conversations between employees, including location and duration. With this data, Waber's team can plot exactly how information flows inside a firm.
Almost every time he analyzes a group, Waber discovers that the super-connector — the crucial person who routes news among team members — isn't the manager. "The manager is almost always peripheral," Waber says. "It's some random guy."