"Another cool creation adding human intelligence to software is VizWiz which aids vision-impaired individuals answer visual environment oriented questions such as who sent you the letter, and distinguish various items in your pantry. Some of these questions are answered as quick as 59 seconds. " - Taken from http://www.trendecommerce.com/experiment-post-amazon-mechani...
The point is, we use Amazon Mechanical Turk to create training sets for Machine Learning algorithms, which I always find really interesting and clever.
This was more of a proof of concept but was pretty impressive. http://code.recollect.com/post/13372390010/mechanical-turk-u...