We’ve released a Akismet for Movable Type plugin and the response from testers thus far has been very good. John Battelle blogs about it here: Akismet for MT: Death to Spam. Also check out this post by Jeff Nolan. “I was spending up to 45 minutes a day cleaning it up.”
Next stop, Akismet for web mail services!
akismet for webmail services similar to spamassasin would be pretty darn cool!