Rosum tracks you through TV signals

This sounds a bit too much like something out of Videodrome for our comfort, but a Redwood City-based tech start-up called Rosum has found a way to track individuals using television signals, reaching places even GPS can't (like inside buildings). And as if the prospect of someone being able to know exactly how long you've been in the bathroom isn't enough to scare you, Q-Tel, the investment arm of the Central Intelligence Agency, is one of the investors in the company. The first device using Rosum's technology is currently in the prototype stage and the company expects commercial navigation products using the technology to start showing up next year.