Start with the founder: Mother-Daughter Book Reviews
The Geo Librarian is an elementary-school librarian with lots of great books to share.
Julie Grasso writes When I Grow Up I Wanna Write a Kid's Book
Kid Lit Reviews
Jemima Pett, who writes lovely middle grade fiction about a pair of hamsters. . .
Katie at Youth Lit Reviews has a really fun feature called "Friday Five" and is currently taking us on a walk through favorite books from decades past.
Those are the main kid-lit blogs I track. But every time we do the kid lit hop, I find another blog or two, so do check it out and see what gems you can find.
Finally, if you haven't already, join the discussion at the "Great Middle Grades Reads" group at Goodreads.com, and ask a whole lot of parents and writers (most of whom are also parents) what might work to get your kid reading!