I stumbled upon an interesting site yesterday - and I wasn't even looking for it!
The Children's Literature Comprehensive Database -
is a site geared especially toward librarians and schools and contains an incredible amount of information, including book reviews and author listings.
Their list of review sources alone is worth it for publishers & authors - a slew of children & YA reviewers of books and other media. Plus authors can sign up for their booking program.
So check out the site!