This is a book for adults as much as children. Kids will love it as it gives a different look at some classic storybook characters. Adults, however, will appreciate the endless jokes and layer upon layer of meaning.
Too much for a single sit down read aloud, this would be a book that I would recommend to a teacher that is doing a classic fairy tale unit. Characters such as Goldilocks, The Little Red Hen, The 3 Little Pigs, The Big Bad Wolf are all highlighted in this book in the form of letters back and forth between the characters. It is a great way to discuss point of view; there is more than one way to look at a situation. This book is a lot of fun!
Apart from pure enjoyment and an extension of classic fairy tales, this is also a great opportunity for readers to connect to their previous experience with these characters. You could also discuss how you write a friendly letter. The author's effective use of voice is another topic that you could introduce to young writers through these humourous letters.