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I know you are probably thinking that this will be some silly thing, but this idea that Thomas Landauer came up with is by far the best I've seen in a long time. Add CSS-hidden fields that a user won't see, but a spam-bot will fill. Then using php check if they were filled, and if they were: block the spammer!

Calling all bloggers! We'd like to enlist your help in making TypePad AntiSpam the best, smartest, free antispam service available. We've launched this beta version in an effort to make the service smarter, and we're counting on your feedback to provide vital information on how to defeat spam more effectively.

TrueTwit is a validation service for Twitter. It distinguishes between people and bots, helps prevent spam, and SAVES YOU TIME in MANAGING (BLOCKING) BAD FOLLOWERS!

I'm sure you've seen them many times -- those wild squiggles that need to be deciphered and typed into a text box before you can buy concert tickets online or access a comment form.

How I use captcha without making my users complete the barely readable word