This is a nice idea:
"As I’ve said before, my recommendation is for libraries to get together, build a common front-end layer, then build your local community while transparently using Amazon’s data. (By transparently I mean: user enters review on your site, it also gets copied to Amazon; conversely, if a user in your area puts a review directly on Amazon, it should show up on your site.) The reason to do this is Amazon has the network advantage – they have way more info than you will probably be able to generate in your relatively smaller local library community. You should be able to easily switch modes: ‘what has everyone on Amazon tagged this book’ vs ‘what tags have local users put on this book’."