If you’re not familiar with Hans Rosling's work, you should take a look at The Economist’s rollup of his TED talks about infant mortality. His style is engaging enough for the article to be entitled “Hans Rosling's greatest hits.” Hans is a great speaker and his presentations are interesting unto themselves, however, another interesting aspect of his talks is that you can leverage his cool visualization software for your own purposes.
The software that powers the bubble motion charts was purchased by Google and is free at Google Motion Chart—you just need to enter your data and run the HTML on any web server.
I have the sample data running on my web server and I’ve also entered the data for the Metalogix support team so that people can visualize how our support workload has fluctuated over time.