Jon Udell has a very good article about using Bayesian techniques to categorize blog postings. I think this is rather interesting, because I keep meaning to try Bayesian filtering on (alternately) Usenet and my mailing lists. The difference between me and Udell is that he went out and did it and got paid for writing about it.
Now that he’s pointed me at the right tools, I may try this on Usenet. Bwah hah ha.