Reviews of books for kids in 2nd-9th grades http://www.kid-lit.com/search.htm
Kid Views Book reviews for kids http://www.eduplace.com/kids/rdg/chall.html
World of Reading Book reviews written by and for kids. http://www.worldreading.org/
Reviews of books for children written by librarians. http://www.bookhive.org/
A website designed to help boys find books that they like to read. http://www.guysread.com/