Spell It Yourself! is great for kids and adults alike who have trouble spelling. Each word has all possible endings, for instance if you can't remember whether "permitted" has two "t"s or one just look up permit and there's your answer.
My son finds this book invaluable for school work. There are no definitions or meanings associated with dictionaries, just straight forward spelling. Great when you don't need a definition, you know what you want to write your're just not sure of the spelling (very empowering for him). It's amazing how his spelling has improved and how much he was willing to use it. The book even includes countries, contraction, names, countries, cardinal and ordinal numbers. An excellent reference book in a handy size.
(Click on the image for more information about the book)