Blocking Spam with CAPTCHAs, Honeypots, and Filtering Services for Ruby on Rails Applications

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Stopping spambots with hashes and honeypots
Ned Batchelder

A lengthy description of various “reverse captcha”/honeypot techniques for preventing automated form submissions.
Inverse Captcha Anti-Comment-Spam Technique: Now A Regular Mephisto Plugin
Sven Fuchs

A very clever technique that traps spam robots but tricking them into filling out a field that users don’t see because it is hidden with CSS. Article describes it in the context of a Mephisto plugin, but the technique has general applicability.