Friday Fun: Visual Complexity

This site is not funny in the manner of my usual Friday Fun messages, but it certainly is fascinating. From the site:

VisualComplexity.com intends to be a unified resource space for anyone interested in the visualization of complex networks. The project's main goal is to leverage a critical understanding of different visualization methods, across a series of disciplines, as diverse as Biology, Social Networks or the World Wide Web …all projects have one trait in common: the whole is always more than the sum of its parts.

Here are the categories:

Art (20); Biology (32); Business Networks (19); Computer Systems (18); Food Webs (7); Internet (26); Knowledge Networks (61); Multi-Domain Representation (22); Others (19); Pattern Recognition (11); Social Networks (43); Transportation Networks (25); World Wide Web (31)

The above illustration is for an entry entitled DIY Store Receipts Network.
The description: A set of 10 million receipts from a large DIY store were processed so as to link together items that often appear on the same receipt. The resultant network of 40K nodes and many links has several important variables associated with the nodes; price, discount, volume, department.