How is this for a blast from the past? Choose Your Own Adventure books were hugely popular when I was a kid. It allowed you to make decisions on what you wanted your main character to do. You would then have options to turn to various pages within the book and live with the consequences. This provided a non-linear way of reading and a single book had tremendous replay value. Choose Your Own Adventure has now come to the digital age on the Apple iPad with ten books to purchase via the iBookstore.
There are ten Choose Your Own Adventure ebooks published by Chooseco, LLC. Each one costs around $6.99 and are aimed at kids and nostalgic parents. I think this is a great idea to publish these kind of books in the digital realm. Instead of flipping pages manually, you simply click on links and are automatically on the page that continues your adventure.