This is the old CAPTCHA hack rewritten to a full addon for PP 1.7. Please note there is a slight difference: the three original variables ($captcha_bgcolor, $captcha_linecolor and $captcha_fontcolor) are not implemented at this point. So you're stuck with the default color scheme at the moment.
<CAPTCHA> tag below the email-form-line in your image or comments template (depends where your comments-form is)That is it.
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Simple installation - thank you very much. Hope it will stop spam.
It works with Defensio on my site...
This is so easy to set up and get running. Thank you for enabling a decent filtering system. No real problems with it, ran first time, and I pretended to be a robot and it got me. 5 thumbs up.