A Wiki devoted to further discussion of issues raised in this article, as well as other news and information related to the spam problem:

Further discussion of issues raised in this article:

Paul Graham's seminal article, “A Plan for Spam”:

Greg Louis has performed extensive testing on the technique described here compared to other techniques:

The Spambayes Project home page:

A phrase-based spam system, CRM114:

The 1971 optimality theorem for Fisher is found in the following paper, along with a description of the technique: Little, R.; and Folks, J. (1971) “Asymptotic Optimality of Fisher's Method of Combining Independent Tests”. Journal of the American Statistical Association, 66, pp. 802-806.

The tutorial by David Heckerman on Bayesian networks: