This is one of the awesomestest and scariestest technology demonstrations I've seen in a long while: Georgia Institute of Technology's students are using CCTV video to map actual vehicles and people into Google Earth. Why is this scary?
Right now, all the data displayed is anonymous, which makes up for a cool looking technology. You could see a football game in real time or the actual traffic in your route to work. Eventually, you will be able to see clouds moving, the weather changing, and even birds move in real time.