From scrolls, to the codex, to e-books, like the Amazon Kindle, the format of the book is changing in our new technological age. A recent New York Times article describes this ever-changing phenomenon and what we should expect to sacrifice in giving up the good-ole paperback.
In the classical world, the scroll was the book format of choice and the state of the art in information technology. Essentially it was a long, rolled-up piece of paper or parchment. To read a scroll you gradually unrolled it, exposing a bit of the text at a time; when you were done you had to roll it back up the right way, not unlike that other obsolete medium, the VHS tape.