I discovered a really neat animated visualization today called Breathing Earth.
It takes population data, births and deaths, as well as CO2 production for each country. In an animation, it shows a map of the world with the births, deaths and CO2 production for each country. There is a running total for how many people have been born or died since you started watching the site. You can also roll-over a country to get information about it.
It's beautifully hypnotic. I love the way the colors change and the little suns appear and disappear over different countries. It's also sobering to see how big the numbers get so quickly.