AutoOCR

Hi,

http://recaptcha.net/learnmore.html exposed:
"...
reCAPTCHA improves the process of digitizing books by sending words 
that cannot be read by computers to the Web in the form of CAPTCHAs 
for humans to decipher. More specifically, each word that cannot be 
read correctly by OCR is placed on an image and used as a CAPTCHA. 
This is possible because most OCR programs alert you when a word 
cannot be read correctly.
...
Each new word that cannot be read correctly by OCR is given to a user 
in conjunction with another word for which the answer is already 
known. The user is then asked to read both words. If they solve the 
one for which the answer is known, the system assumes their answer is 
correct for the new one. The system then gives the new image to a 
number of other people to determine, with higher confidence, whether 
the original answer was correct. 
"
Thus 
Real OCR = AutoOCR + human eyes 

Any ideas, or scripts?
Valery