This seems to be a very promising application. Any one tried to experiment with it.
With Gapminder, as Ionut writes, “you can visualize World Development Indicators from The World Bank. You will see a scatterplot where each bubble represents a country. The position of the bubble is determined by the indicators on the axes. The size of the bubble represents the population of the country.” [Thanks Justin Flavin and Ionut Alex. Chitu.]