NewOCR.com is a free online OCR (Optical Character Recognition) service. NewOCR.com can analyze the text in any image file that you upload, and then convert the text from the image into text that you can easily edit on your computer.
Unlimited uploads, no registration, layout analysis (multi-column text recognition), 29 languages support, image files (JPEG, PNG, GIF, BMP, multipage TIFF) up to 5 MB, multipage PDF documents up to 20 MB

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 ... Each word that cannot be read correctly by OCR is placed on an image and used as a CAPTCHA.