Dymphna's thoughtful post at Gates of Vienna about the evolution of blogs got me thinking. How would we determine which blogs are important? Which are the opinion leaders? Do we just measure number of hits? number of unique hits? Shortly thereafter mulling this question, an old synapse connecting my last few grey cells fired.
When I was working on interlocking board of director memberships in art organizations and other cultural organizations, I ran across a metric called the "centrality index". In short, it is an algorithm to look at a social network and determine the important nodes in that network. The process is described in reasonably lay terms here. Perhaps our mathematicians could look at it and see if it is relevant--My impression is that it would be a relatively simple research project to undertake.