International Network for Social Network Analysis
An organization focused on social networks (no surprise there) but also the source of a number of interesting resources, such as software and data sets.
There is a workshop on NetworkX to be offered at Sunbelt 2011.
Registration for the workshop closes 24 January 2011.
The family tree topic map demonstrated by Eric Freese, years ago now, is one example of a social network.
Both the site and organization merit a close look.