Multi-language Wikipedia!
Select from over 70 different Wikipedia sites from the settings. Once selected, all newly created books will fetch text and images from this Wiki. Currently supports all Wikipedia's with over 100,000 articles.
Also added: Volume buttons change pages when viewing books (thanks to @xmha97 for the idea)
Make your own books
Create your book, search for wiki pages, watch images and text flow onto your pages.
Learn with your kids
Interested in biology? Want to build a book for you and your kids to learn more about it? Try creating a new book, add some pages by searching for Organism, Animal, Plant, and then Fungi, then watch your book come to life.
Share your creations
Generate a PDF and email it to a friend, or print it for your own physical book.
Limitations
This is still in the early stages of development. Some things which are on the roadmap: