Okay, I really need to subscribe to Matthew Hurst's blog, Data Mining. There, done.
Hurst works for BlogPulse/Intelliseek/BuzzMetrics/Nielsen, whatever they are today. They specialize in bringing hard core techniques from the AI community to bear on analyzing and understanding a large chunk of the blogosphere. He's had a recent series of interesting posts on a variety of topics including distance based coloring in graph viz, the long tail of the blogosphere, and modeling the influence of visit traffic sent from other blogs.