Turn off your car radio

A company called MobilTrak has invented a device that can pick up the electronic signal from your car's antenna and record which radio station you're listening to. "It's all about precision marketing," says MobilTrak managing partner C. David Boice. "It's about giving marketers real-time data about what's happening in certain areas at certain times so they don't waste their advertising dollars."

Currently, MobilTrak picks up only FM signals, but the company says it plans to introduce technology that picks up AM and satellite station signals next spring.

And after that, technology that picks up brain waves...

http://www.washingtonpost.com/wp-dyn/articles/A60013-2004Oct24.html