I found an interesting graphic yesterday . This infographic is designed to show the history of ebooks over the last 40 years, and how e-books have history and heritage. They are with us, in many cases, for the whole life – and in many cases we didn’t even know about it.
Edit: this was made by Piotr Kowalczyk, of Password Incorrect.
You can click on the image at right to see a full size version (so you can download it).