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.