I have the glorious problem of also having a 2nd grade son, who has caught the family bibliomania, but is hard to find books for. While his reading comprehension is also well above grade level, his emotional maturity is behind, AND he likes very different things than my older son.
The Book Whisperer is one of a batch of books that I picked up from the library to mine for suggestions of books to potentially suggest to my sons. I found myself hooked and finished in less than a week. And while she didn't have many suggestions appropriate for my kids, I found Goodreads through her resource section. So perhaps here I can find more books to summon from the library.