Common Sense Media - a non-partisan, not-for-profit organization providing reviews of books, movies, games and apps to help educators and parents make informed decisions.
http://www.commonsensemedia.org

Goodreads - provides insightful reviews and critiques on books and maintains a list of Goodreads Choice Awards
http://www.goodreads.com
 

Recommended List of Books for 5th -8th graders to read
https://www.goodreads.com/shelf/show/grades-5-8
http://childrensbooks.about.com/od/forparents/tp/summer_reading.htm