maybe I should have called this data visualised.
Same map - but with google traffic visualised over the course of 24 hours.
http://labs.google.com/papers/sawzall-20030814.gif
From
Nat Torkington's blog.
I like how it almost beats like a heart - you can't see the earth revolving - but it's like the sun passing across the face - and the planet beating. Some places just burn 24/7 though.