There's never been a better time to be paranoid, because there's never been a time when it's more likely that you really are being watched. Check out the poster for London's new transportation security system. Combine that with the Total Information Awareness Office logo (which has been removed from the DARPA web site) and you can rest assured that the feeling you're being watched is most definitely not your imagination.
Update: Don't forget to go to the London bus web site, where the "watchful eyes" blink at you creepily. Freaked out yet?