Visualizing Networks with Hive Plots (bost.ocks.org)

d3.js is ideal for custom visualizations like Martin Krzywinski's. Another neat one is the chord diagram, based on Circos.

http://mbostock.github.com/d3/ex/chord.html

http://circos.ca/

It's also straightforward to transition between datasets and layouts:

http://exposedata.com/tutorial/chord/latest.html

Mike Bostock's D3-based Hive Plot demo is an excellent showcase for D3, Hive Plots, and their excellent synergy. D3's detailed graphics and highly interactive feedback make hive plots "come to life", showing off their defined and predictable diagram layout, as well as their high data density.

For a summary of the effort's background and prospects, see my status report (http://groups.google.com/group/d3-js/browse_thread/thread/ba...).