Carson Farmer's repository may be out of commission for the time being, however there are a number of other options for creating cartograms like the one you described.
Cart, by Gastner and Newman using their diffusion-based method
http://www-personal.umich.edu/~mejn/cart/
Cartograms, by Widdle (for Windows)
http://www.griddle-gidata-analysis.com/page2.htm
ScapeToad, by Choros Laboratory using the diffusion-based method:
http://scapetoad.choros.ch/index.php
Provotis, by Stanford Visualization Group includes tool for Dorling Cartograms
http://mbostock.github.io/protovis/
IndieMapper, by Axis Maps produces noncontiguous cartograms
http://indiemapper.com/app/