Kills spam-bots, leaves humans standing. No CAPTCHAS, no math questions, no passwords, just spam blocking that stops spam-bots dead in their tracks.
Since the vast majority of WordPress spam is automated in nature, the goal of BotBlocker is to block comment spam bots and not hinder users. This is accomplished through the use of honeypot technology, which tricks the spambot into identifying itself by performing actions that a human could not.
BotBlocker's features include:
wp-comments-post.phpto prevent spam-bots from directly submitting spam comments
http://www.lform.com/botblocker/ for more information.
Plugin by LFORM, a web design company in New Jersey.