Diagrams, maps, infographs allow fast insights in sometimes complex data.
There are myriads of visualisation sites .. and some aggregators to be mentioned. Here are some of my favourites (yours?):
World Bank’s visualisations specialize in poverty:
Every week owni.fr
gives fascinating examples of visualisations, in French and other languages:
And not to forget Pinterest
where The Next Web curates an infographic selection:
And this: blogstats published 205 visualisation posts since September 17, 2006,
mostly focused on statistics (no guarantee that all the links still work ;-).