UPDATE: Google buys ReCaptcha | official one
Continuing my curiosity with CAPTCHA's, I came across this amazing initiative here.
This project involves digitizing books using solved CAPTCHA's. Over 200 million CAPTCHA's (words) are decoded by real people everyday. So this novel idea involves using this effort to convert books into digital books. In the past we have used OCR (Optical reader) software. But OCR's are not accurate enough. Combining OCR + human intelligence with CAPTCHA's is a killer idea!
Similar efforts were implemented by Google to improve its image search results called 'Google Image Labeler'. But reCAPTCH project is taking social human intelligence to the next level.
What can be other ideas of using human effort to make meaningful contributions? Few ideas I can think of are - music tagging, video tagging, using spelling mistakes as a feedback to spell checkers.... What else? Any suggestions?
Related Blog: CAPTCHAS that make me feel illiterate