I was reading an Amazon book review written by a child and it gave me an idea.  Sometimes I have my son tell me about the book he just read, sometimes I have him write about it.  When it's one of those times that I want him to write about it, why not have it also be a review on Amazon? 

I think it would make it more fun for him because his review would be posted on the WWW, and other children thinking of reading the book could find out what it was about and what another child thought of it.  Of course we would have to watch out or warn of spoilers, but I think it could be fun.  His written narrations are typically of picture books we have read, while I usually let him verbally narrate chapter books as we go along.