I’m a big fan of Jay Allen’s MT-Blacklist plugin for Movable Type. It’s a wonderful way of keeping out spammers from leaving your site comments full of shite links to casino sites or worse. In
In order to keep your site protection up to date it’s best to update the blacklist with the latest, er, blacklist, and I’ve just done that. I’ve now got over 1300 banned URLs, and it’s a piece of weewee to update it myself. I still get the occasional penis posting porn links, but these are easy to remove and then ban.
If you use Movable Type and you don’t have MT-Blacklist, I seriously suggest that you install it.