hello,
these cartograms are not very important for a GIS but fancy and nice for a
presentation, hence it would be great to have them implemented in GRASS (as
add-on)
have a look at
http://www-personal.umich.edu/~mejn/cartograms/
the original paper can be found here:
http://www.pnas.org/cgi/content/abstract/101/20/7499
there does some code exist, but haven't found any licensing informations
http://www-personal.umich.edu/~mejn/cart/download/
http://www.santafe.edu/~mgastner/
Martin