I’ve just finished watching a presentation by Richard Fairhurst - http://www.youtube.com/watch?v=Geq-bCD3zN8&feature=youtu.be and he gives a fantastic site for visualizing live data.

http://live.openstreetmap.fr/ is fascinating to watch! It’s hard to believe in the five minutes that I was watching it there were over 100 user contributions totalling over 30000 changes!