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From: PA
> Anyone has a suggestion for a simple (simplistic?) CAPTCHA mechanism? 
> By simple, I mean not necessarily requiring heavy duty image 
> generation 
> or such...

A math-based CAPTCHA is exactly what I designed for a (Ruby) quiz a
couple years ago. I cannot vouch for its effectiveness versus bots, but
it seemed like it would be a sufficiently annoying amount of custom
programming for spammers to fight.