Kim Rees at Flowing Data writes of a new network visualization technique by Cody Dunn:
In essence, he aggregates leaf nodes into a fan glyph that describes the underlying data in its size, arc, and color. Span nodes are similarly captured into crescent glyphs. The result is an easy to read, high level look at the network. You can easily compare different sections of the network, understand areas that may have been occluded by the lines in a traditional diagram, and see relationships far more quickly.
The explanation is useful but I think you will find the visualizations impressive!
Check Kim’s post for images and links to more materials.