As a math teacher, I am often frustrated with the lack of value that textbooks bring compared to their potential. Oftentimes students see them as little more than a source of questions, to the point that they sometimes forget (momentarily, at least) that they also provide additional examples and answers. The more interactive textbooks become, the more likely that students will actually use them as resources to aid in their understanding of the material that the questions in the textbook are challenging them with. Just the other day I was teaching a lesson on graphing, and the brand new textbook I was using made reference to a free graphing software website, showing instructions for students so they could create graphs using technology rather than by hand. In a digital form, the same textbook would, I imagine, have the ability to link students over to that software where they could attempt the task themselves. It could also have provided screencasts of the task being done, for those students needing extra guidance to complete the task.