It seems like there are easy improvements to search by ratings they could make. If I am browsing for a new book, I'd like to be able to search by number of reviews alone. Anything with more than 500 or so reviews is probably worth taking a look at. I also would like to filter out items with less than 'x' reviews or search by a ratio of number of reviews to the number of stars. This might hurt products trying to get off the ground, but I'd really like it as a user.