Book Reviews

Commercial sites 

Read reviews and buy the books.
Amazon
Barnes & Noble

Sites for kids and adults

The Book Hive
Recommendations from the Public Library of Charlotte & Mecklenburg County, North Carolina. 

Kidsreads
Book reviews, author profiles & interviews, excerpts of new releases, literary games & contests, and more.

Professional journals

The Bulletin of the Center for Children's Books
One of the nation's leading children's book review journals for school and public librarians.

The Horn Book
A journal of children's and young adult literature. 

School Library Journal
For school and public librarians.

Other sources 

Book Spot
Guides to children's literature, book reviews, best-sellers, and more - all in one spot.

The New York Times Book Review
Reviews of children's books from this national newspaper.

Sidekicks
Graphic novel reviews for kids up to age 12.