CAPTHCAs are a terrible, terrible solution to a technological problem. But at least these CAPTCHAs acknowledge that the person typing is not only not-a-bot, but a human being.
Yes, yes, yes! This article does an excellent job of explaining what Captchas are attempting to do and why, therefore, they are so utterly shit.
Captchas reinterpreted into art.
An API for Turing test questions.
If you do insist on having a captcha, why not make it a bit more interesting? Also: best blog post title ever.
There's no such thing as a good CAPTCHA but if there were, these would be ...Best. CAPTCHAs. Ever!
Brothercake looks at the problems, issues, and alternatives to requiring a human to prove that they're not a bot.
Now this is what I call a captcha. You want to know about my mother? I'll tell you about my mother.