A genius at CMU came up with a way to have many people help correct the OCR in our books. Very cool.

http://recaptcha.net/

audio news:
http://www.npr.org/templates/story/story.php?storyId=10936942&ft=1&f=1006

text news:
http://www.washingtonpost.com/wp-dyn/content/article/2007/05/27/AR2007052700771.html

-brewster