I’ve just installed Kitten’s Spaminator on this site. Go into your Plugins page and activate it there.
Kitten’s plugin “combines the best of Tar Pit & Three Strikes” as she says on her blog. It’s a great idea, scoring comments based on spam words and links. Unfortunately there’s a bug in the plugin running on her site so I can’t comment on her blog. Kitten – please change $this->strike_cnt = 10; to $this->strike_cnt = 0;
All comments get trapped otherwise!
I’m playing around with the rules, I added a check on the URL, the plugin goes through all the rules regardless of wether referer and link count checks return true or not. It’s fairly benign unless you actively teach WordPress about your comment spam. Next time you get spam copy the URL, first 3 number from the IP, and email into your spam words textarea in Options->discussion. This post will probably be updated throughout the day.
13:50 – if no email entered then automatically notch up one strike.

As this post will appear there, I won’t make a big deal of it, but WordPress development can be followed at WordPress Planet, an aggregator collecting posts from here and other WP developer’s sites!