Check out:
http://www.cio.com/archive/110106/tl_rome.html
talking about this story on cell phone data used in real-time mapping to learn about how overlay maps like:
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were created in real-time using anonymous cell phone and gps data. Cool stuff!
There's an incredibly cool movie clip of the cell phone maps in motion.
that will make you knock yourself out out of sheer amazement of the simplicity and coolness of it all.