For some more information on network visualization check out David Glecih's website http://www.stanford.edu/~dgleich/. He is one of the authors of the World of Music Paper mentioned in the paper. He has done a lot of work on visualizing high dimensional datasets. He has also done a lot of work on the computational side of complex network research. He released a number of Matlab packages that related to the subject. Also check out his artistic visualizations of the Flickr network http://www.stanford.edu/~dgleich/demos/visualizati ons/index.html.