These sites comes recommended by various media professionals. This site is designed to serve K-12 libraries. Look under reading lists for suggested readings etc. Recommendations from LM-Net are included in their reviews.
Book reviews are both children's books and professional books.
Includes text of the periodical. ALA's counterpart to their hardcopy BookList. Includes a search engine. Includes book reviews, listed by author, and written by this gentleman and posted to LM-Net. This is mostly for middle school.