Hosted by Google, Gapminder offers for countries around the world perhaps my favorite kind of graphical representation -- the two dimensional scatter plot (e.g., per capita income on the horizontal axis versus life expectancy on the vertical axis), with bubble size representing population, and color of bubble representing region of the world. You can then animate the graph to track how one or more countries has done over the 1975-2004 period.
"Cool Tool:"
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