This includes a link to available books that is updated constantly. John Norton receives the books from publishers and authors. It is mailed to you for free, with expectation that you will write a review for publication within a reasonable amount of time.
I've been on Richie's email list for years (and I've even met him), but never thought to look for a single place that holds all of his reviews. He writes some of the most complete reviews I know of, always connecting the books to other events, songs, or materials. I'm often jealous when he writes reviews for great books months before they are released.
OASIS offers users worldwide the ability to search a range of OER materials including textbooks, courses and corresponding materials, interactive simulations, public domain books, audiobooks, modules, open access books, videos and podcasts on a variety of topics - from anthropology to zoology. OASIS also is the only tool that allows users to limit searches by creative commons licenses or by faculty review.
This blog, started by two New York moms, reviews many children's books. They are searchable by title, author, reading level, and more. Their rating system is a bit different than many other (such as levels of humor)