We have just purchased the review component of LibraryThing for Libraries. I thought it would be a great addition to the catalog. One of the features is the ability to write our own review and add it to the collection. I thought great, but was sure that it will be ignored by patrons. As you can see I was wrong, so far we have 58 reviews. I cannot think of a better product that engages the patron and gives them a  sense of ownership.