Are there any measures that can be taken to prevent spambots from creating user accounts? Any chance of making new users decipher a sequence of partially distorted letters/numbers, as part of their account creation? (I presume this feature is indeed a 'spambot filter')
I find their 'thread hijacking' antics (in particular) slightly irksome.
It's an unwinnable war really, but I've (reluctantly) included a recaptcha form for new user registration. Let's see if that makes any difference...