Cartia provided an interesting visualization tool but now seems defunct http://www.cartia.com (wasn't responding when I checked)

Denham Grey has an up-to-date wiki page at
http://www.voght.com/cgi-bin/pywiki?KmMapTools

with juicy keywords like Social network tools: Sociograms, social network analysis, information mapping, navigation aids.

Some of the links are dead (like cartia) but the page seems well-attended to...lots and lots of other interesting stuff off of denham's own page...

And here's a recent Valdis Kreb's article "The Social Life of Routers" - applying human network concepts to the design of physical networks...
http://www.cisco.com/warp/public/759/ipj_3-4/ipj_3-4_routers.html


J