Several years ago, I attended a seminar on future technology hosted by Bruce Sterling.
To him, it's all about information communication, RFIDs and things talking to things -- for example, a bottle of whiskey could communicate via RFID to a handheld reader its contents, history, tags etc.
Now they're trying to do the same with cars. Hari Balakrishnan at MIT is equipping cars with mobile sensors to send data to a central computer and predict road conditions.
There's another professor at Boston University who's experimenting with using car signals to communicate with other cars -- sort of like the telephone game where a message is passed down along a chain of people.
Food for Thought: would the message will be corrupted when it's passed down the car chain?
Source: http://dvice.com/archives/2008/11/outfitting_cars.php