I had no idea this was something he had even worked on. The Children of Hurin was a great story, one I would love to see retold on the silver screen someday. Being a lover of all things Tolkien, I'll have to get my hands on this book soon and read it over the summer.
I loved the book, and would also love to see it in theaters one day, but that sure would be one sad movie. There aren't too many happy moments in the book.