Google Bayesian Spam Filtering Problem?

New Google report from Seth Finkelstein:

Google Bayesian Spam Filtering Problem?
http://sethf.com/anticensorware/google/bayesian-spam.php

Abstract: This report describes a possible explanation for recent
changes in Google search results, where long-time high-ranking sites have disappeared. It is hypothesized that the changes are a result of the implementation of a "Bayesian spam filtering" algorithm, which is producing unintended consequences.

Seth Finkelstein's Infothought blog (Wikipedia, Google, censorware, and an inside view of net-politics) - Syndicate site (subscribe, RSS)