Another Monster at the end of this Book...Starring Grover and Elmo! is a fantastic interactive children's book for the iPhone and iPad. The story is about a book that Grover and Elmo encounter that is supposed to reveal another monster at its conclusion. Grover is opposed to reading it because books about monsters make him uncomfortable. Elmo, on the other hand, loves monsters and can't wait to get to the end of the book.
Ruckus Media Group has released an interactive storybook - My Little Pony: Twilight Sparkle, Teacher for a Day. In addition to being a book, My Little Pony includes activities that teach early reading and problem solving skills.