ebooks are moving massively to the iPad, iTouch and beyond. This is an example of a series for preschoolers which has words AND will read it to you. (Dual encoding is a proven way to improve comprehension.)
Members of CUE in California are discussing this older post from 2006 about the lessons of change. I loved reading this because so much has happened since this time and yet I still agree with what I said in this!