Captchas are those annoying, spamatuer “type this so we can stop spam” things that you see on some blogs.
PWNtcha stands for “Pretend We’re Not a Turing Computer but a Human Antagonist”, as well as PWN capTCHAs. This project’s goal is to demonstrate the inefficiency of many captcha implementations.
For an overview on why visual captchas are a bad idea, see Matt May’s excellent presentation, Escape from CAPTCHA, as well as the W3C’s Inaccessibility of Visually-Oriented Anti-Robot Tests working draft.
See PWNtcha – captcha decoder. I look forward to the day when someone builds this into my broswer. (Via Justin Mason’s Del.icio.us feed.)