Visualizing complex networks

I came across this interesting website, called Visual Complexity, that has a collection of images from various projects that aim to map and produce visualizations of complex networks. These include biological, computer systems, social networks, the web itself, and others.

The image below is a map of the blogosphere from here.

The value of these to me aren't so much in using them as a map....as in to navigate the blogosphere with the above image....but to appreciate the nature of networks.