Actually the USA is rumored (confirmed?) to have a massive intelligence gathering network called eshelon which is supposed to be monitoring all faxes, IP comunications and voice. I've read that this network has at least a keyword search for all these forms of communication. This network is not supposed to be used on american citizens. However, I think I read that, because eschelon is shared between countrys, the US has been sharing what we know about "them" and what they know about "us". This essentially made it possible for the US to spy on the US.. And this happed way before 9/11....
This is all nebulus and frighting, but really hard to determine a speciffic threat, to at least my own freedom. What would be a speciffic thing I might as well worry about? [Lets assume that eschelon is real]
With voice recognition, anytime you use a phone, your location can be determined.
All cell phones will be required to contain GPS chips within 2 years.
Government is clamping down.