There is a spam filter that prevents edits with specific words. If you can remember any unique ones from the spam, I could add them to that list.Gez wrote:Tonight was attack of the spam.
As far as CAPTCHAs go, I think the best one for Mediawiki is still the reCaptcha one, and probably the only thing saving it is that it isn't included in a standard install. As seen with the forum starting last month, it has failed wildly with phpBB, probably because it became very common on such boards.