reCAPTCHA - Fighting Spam, Book By Book

A cool new CAPTCHA script (cleverly named "reCAPTCHA") takes all the ill-tasting monotony
out of posting an article, and replaces it with the heartwarming knowledge of bettering humanity.

Instead of merely typing a random character code, reCAPTCHA uses words from books which have been digitally scanned for archival purposes.

Why is this cool?

Because, it uses the user input to clarify formally "unreadable" text from the digital copy of the book (Words that the Optical Character Recognition software couldn't properly convert).

Example:

Check it out with this live demo: