Several previous posts on BlogJoy were about online resources on children's literature to which you could subscribe and receive free monthly updates. Just in case you didn't subscribe (tsk, tsk), here are descriptions and links to a few of the recent updates:
ALA Booklist Online: ReAD Alert: includes a review of Sacrifice by S. J. Bolton and a feature article on the year's best crime novels.
Notes from the Horn Book: includes annotated lists of books about brothers and sisters, summer suspense novels, and jazzy picturebooks. Also five questions for mystery writer Mary Downing Hahn.
Center for Children's Books: includes bibliographies on dystopia and under the sea.