Lurker finally posting. I am sure that in time all books will provide an electronic format as handheld computers become less expensive, more common, and encryption software to secure ebooks become usable and uncrackable.
My son at age 10 uses one of my old Casio BE300s (with epod os hack) to read countless books. He uses it because he like all to many of us is dyslexic. It is a great way to format the book so he can read it (short lines bigger font).