We are in the first year of a 1 to 1 iPad initiative in our middle and upper schools. Some of our teachers are using Net Texts in place of textbooks. I'm having great success with this new tool. In fact, I'm moderating a blog for social studies teacher for Net Texts. If you are interested in joining the discussion, please let me know. I can provide some additional information, would love to hear what you are doing, and can arrange for you to join the discussion at Schoology.