Whom do you hang with maps: http://www.npr.org/blogs/krulwich/2013/04/16/177512687/a-whom-do-you-hang-wit...
Carbon Map: http://www.carbonmap.org/#intro
UK Election map: http://www.guardian.co.uk/politics/interactive/2010/apr/05/general-election-m...
Value by Alpha map (static): http://www.cartogrammar.com/blog/value-by-alpha-maps/
Dorling Cartograms: http://mbostock.github.io/protovis/ex/cartogram.html
Another: http://www.datadrivenconsulting.com/js/protovis/cartogramemp.html