Here’s a pretty good video discussing the current state of surveillance technology being used at the moment.  I would caveat that because after the Snowden revelations I am sure this video does not even scratch the surface about what is being used to spy on us as we go about our everyday lives.

It discusses real-time surveillance much like google earth in real-time that is being tested (and probably being used now, but with a much higher resolution than we are being shown).