Book Blogs Search Engine::

"Looking for reviews of a book by real-life book bloggers? Tired of sifting through corporate sites in your regular Google search results? That's why I created the Book Blogs custom search engine - all book bloggers, all the time! Whether you're looking for other non-commercial reviews of a book you've just read, or want real readers' opinions on a new book you're considering, this is the place."

You can see which blogs it searches at Book Blogs Search at Fyrefly's Book Blog, written by Nicki Gerlach, the creator of it all.