An Australian library was quite successful in allowing users to submit corrections to OCRed texts.
http://www.dlib.org/dlib/march09/holley/03holley.html
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User feedback returned via surveys, e-mails, phone calls and the "contact us" form has been overwhelmingly positive and interesting. Users did not expect to be able to correct OCR text. Once they discovered they could, they quickly took to the concept and method, and several reported finding correcting the text both addictive and rewarding. Users were actively correcting much more than they or we had expected to correct. In addition, our own users have the potential to achieve a 100% accuracy rate with their knowledge of English, history and context, whereas our contractors are only achieving an accuracy of 99.5% in the title headings.
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I think Google or Amazon should implement something similar.