Spam beats Bayesian Filtering
The Fishbowl: Bayesian Filtering: The Spam Fights Back. BEsids having the absolutely best tagline for a web site (tail -f /dev/mind > blog), he does a good job explaing the latest attacks on spam filters.
I've been using a Bayesian filter called popfile with good results, but this latest attack will mystify it.
"Spammers Compendium":http://www.jgc.org/tsc/index.htm. is a great insight into how the other guy is thinking. It's kept by John Graham-Cumming, the guy who wrote popfile and a leading anti-spam expert.