Everything Burns: The Daily Bayes
http://jimfl.tensegrity.net/eb/archives/001423.shtml
"Combine the naïve Bayesian classifier at the core of many spam filters with a pool of RSS news feeds and, with a little training, it would be able to decide which news items you got presented with." Mental note to remember this article.
btail - a bayesian log filter
http://www.vanheusden.com/btail