My librarian friends subscribe, as they should, to the American Library Association's publications as ALA members. Since I didn't have that resource for help in choosing great books for kids, I sometimes called or emailed them to ask for recommendations and critiques. Thanks to The Horn Book, you don't have to do that, even if you have librarian friends yourself!
You can subscribe to their print or online publications, such as The Horn Book Magazine:
OR, you can read many, many recommendations and reviews for free at their website! A great example is their 2012 Summer Reading List. It's divided by level, from Picture Books to High School. I LOVE free, and I'll bet you do, too!