Hmm, sounds like an interesting solution. However, as I said above, we have had virtually no spam-bot registrations since adding the anti-spam questions to the registration form, therefore I see no reason to go messing about with the code to add further measures...

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If the anti-spam questions are a built-in phpBB feature, the bot writers will begin to parse those questions and provide the correct answers automatically, and those questions will lose their efficacy. At that time (when spam bot registrations are increasing) - you should consider some of these other ideas.

Any thoughts on the Mac question idea? I thought that was pretty good.

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They are implemented using the "custom profile fields" feature of phpBB, but they're not a standard feature when used in this way. The specific questions and the names of the fields that they use (etc) are unique to this forum, which should make writing something to solve the questions significantly more difficult (and I don't think we're a particularly high profile target). I'll see how it goes. I don't see any reason why a Mac specific question would provide that much more security than a basic maths one... but we may well try it if the number of registrations starts to increase!