I tried reCaptcha and several other blocking methods over the years, but the one that seems to have worked the best is adding several "are you a bot" type questions that are specific to the site content. The idea is to come up with questions that are somewhat easy for your target demographic to answer, but are hard for random spammers to figure out without a bit of research. Sure, some people are determined and will still get through, but it makes it hard enough that many don't bother. The tough part is coming up with good questions.
GroovyMAME support forum on BYOAC
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Re: Anyone run a forum?
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Anyone run a forum?
