A good series of posts from the “A Computer Scientist in a Business School” blog on the topic of the Amazon Mechanical Turk (and using it to solicit reviews of products):

• Soliciting Reviews on Mechanical Turk
• Time Out New York and Mechanical Turk
• Is it unethical to pay for reviews?
• Monitoring the Dynamics of Mechanical Turk
• Duration of Tasks on Mechanical Turk

Also a very cool chart about the MT activities created with the Google Chart APIs.