The Cadillac of bayes classifiers is CRM114--it can use classifiers that are far more advanced than naive bayes, such as clustering, or with hidden markov modeling.
No doubt, I'll be combing through all of the CRM114 information on the website. Is there anything that is not referenced there that will be of use?
learn ham.css < file_to_learn.txt
learn spam.css < file_to_learn.txt
classify < file_to_classify.txt