According to the article, Luis von Ahn...
created a tool, called "recaptcha," that pairs an unknown word with a known one. He distorts them both and puts a line through them--standard techniques for creating captchas. A user must decipher both captchas to access a site. The accurate typing of the known word serves the security purpose of captchas and adds a measure of confidence that the unknown word was identified correctly and can be used in place of the OCR's gibberish. Volunteers have begun deploying recaptchas, and the technique has been used to decipher two million words for the Internet Archive's book digitization effort.The article does not say where this technology is being used. It would be cool to know where. I'd actually be interested in doing them just for fun (and to help out).
Addendum (2 p.m.): Thanks to Kathleen for checking out the web site and adding some info in a comment below. Yes...we can all help with this effort, although not a plug-in for Blogger yet.
Technorati tag: OCR