I just got a book that you might like, recommended by someone on here. It's called 6+1 Traits of Writing, and it's actually part of a whole collection that has school packages, workbooks and stuff -- but this book is fine all by itself. I haven't even finished it yet, and I can tell that it will be a great help for DS8 and I wish our school would go to this program.

You can see it here on Amazon.