Five years of Kiva microloans
I'm a huge fan of Kiva and loan pretty regularly through them, mostly to SE Asia (and particularly Cambodia after my visit there last year). This is a stunning visualization of the microloans passing back and forth globally (ie. loans going out and then being repaid) over the five years Kiva has been in existence. Mind-blowing, though personally other music and a running total of loans to let people grok magnitude would have made it even better. Still, astounding to watch.
Full screen it for max effect and keep in mind Kiva has a repayment rate of 99% on loans of $240 M. So, if you haven't already, sign up and send some money where it'll do some great good.