I noticed this feature on the page for the Amazon Blackberry App.
I haven't yet tried the app or seen the feature working so I do not know how well it works.
Perhaps we need an application which allows you to take a picture of a book cover and find it in your library ... Or which allows .....
Update: apparently, Amazon Remembers uses human effort to match images to fulfilment opportunities on Amazon. See here for details of how the Mechanical Turk application supports this application. .