Cool interactive chart on Snippets.com that shows the GDP per Capita of every country (so it claims).  It has a number of predefined groupings like Continent, UN Members, OPEC, Communist, Largest Area, etc to show comparisons.

The interactive chart below represents the GDP per capita for each country. Click on any of the buttons to view the data for that particular group of nations. You can highlight a particular country by selecting it in the dropdown box. The data was compiled from the 2008 CIA World Factbook.

Thanks for the link Jerry!