Gapminder by Hans Rosling.
If you don’t know the name, Hans Rosling, you should.
A promoter of the use of statistics (and their illustration) to make sense of a complex and changing world.
Hans sees the world from the perspective of a public health expert.
Statistics are used to measure the effectiveness of public health programs.
The most impressive aspect of the site is its ability to create animated graphs on the fly from the data sets, for your viewing and manipulation.