I haven't done much digging in this space until recently. If it interests you here are some other things worth looking at:
- A Kindle in Every Backpack
- A Kindle in Every Backpack?...Would we even need backpacks?
- The Future of Digital Textbooks (download the PowerPoint slides)
- 2010 Horizon Report
- Building Research and Writing Skills Through Student Authorship of Wiki Textbooks (download pdf of slides) [The student task of "semantic architect" is brilliant!]