I think this would be an excellent book to bring to show-and-tell in the classroom of a child with celiac disease. It would not only educate the teacher, but also give your child's class a kid-level explanation of why your child can't eat what the other kids are eating.
Although I haven't shared this book with any kid yet, I plan on reading it to my gluten-intolerant nieces and passing it along to a mom of a celiac very soon.
To learn more about this book, please visit: www.celiackidbook.com
Update: The Celiac Kid is now available at a reduced price of $6.50 (regularly $7.95) on their website. They also offer discounts on large orders.