My ability to keep up with the thread was lost a couple days ago so I'm playing catch up. My current thoughts are:

-Setup a dedicated gallery for this project.
-Subscribers can submit images and vote on images.
-Submission of an image also denotes that you are highly interested in purchasing the book.
-Top 50 images are awarded a place in the book
-High quality scans are obtained for each image
-Each image owns two pages in the book. Page left photographer bio and tiny portrait + full image technical details, image itself resides page right
-Book is POD to minimize risk

Something like the above?