Urgh, spam.  What to do about it.  MediaWiki has an article here that might be helpful.  Bella has already taken one of its ideas -- disable anonymous editing -- but that clearly hasn't solved the problem.  I suggest that we try implementing the ConfirmEdit extension mentioned on MediaWiki.  ConfirmEdit sets up a CAPTCHA that should block most editing by bots.  We could use QuestyCAPTCHA, which requires editors to answer an administrator-defined question; on IRG, you can't register unless you know the color of Saionji's hair, which is enough trouble to deter many human spammers from registering.  Apparently there is even a way to configure ConfirmEdit so that approved users don't have to go through the CAPTCHA system.  Doesn't sound like a bad idea.