Gone are the days when a book was simply a physical assembly of folded and gather pages, bound as a series of chapters in a case or paperback perfect binding. Gone are the days when the only formats publishers had to concern themselves with were hard cover, trade paperback or mass market paperback. In today’s world a book can be a file format; it can be content tethered to an application; a dynamic mash-up of chapters, or selections of content from separate works, published by separate houses. Walter and Scott discuss evolving platforms, formats and devices that publishers need to be aware of as the traditional publishing model is transformed.