E Books Why isn't this

E Books

Why isn't this taking off? Advantages -- one hand to hold book and turn page. No annoying keeping the book open while reading. Backlite to read in bed/plane. Great for travel -- light weight.

How is ebook different form audio books (which is avialable widely)? Someone can duplicate an audio book on cassette easily, onto MP3 or Minidisc, add chapter marks, etc. How about feeding audio books to speech-recognition software to transcript it?