This is a really intriguing appliation that compares countries/states with each other in terms of population/income/ and basically any other user uploaded data.  Here is their “about us” section:

“Gapminder is a non-profit venture promoting sustainable global development and achievement of the United Nations Millennium Development Goals by increased use and understanding of statistics and other information about social, economic and environmental development at local, national and global levels.

We are a modern “museum” that helps making the world understandable, using the Internet.”

- Gapminder.org