I recently had an opportunity to briefly visit the Indianapolis Motor Speedway (home of the Memorial Day weekend Indy 500 [satellite view]) while the teams were practicing. A surprisingly large crowd was on hand to watch the drivers, mechanics and managers test their vehicles, systems and methods. Many, but not all teams had quite a number of computer operators keeping an eye on all aspects of their cars.
Danica Patrick easily grabbed most of the crowd's attention. A group of fans and photographers never left her team's side. More photos here.