Kindle is developing a feature allowing readers to query authors (@author). I have been attempting to get my past publisher to understand this possibility for years. Technology allows opportunities for blurring the lines among traditional roles – say student, teacher, content developer. I imagine more roles and more possible opportunities for interaction. You are starting to see some of this – e.g., readers can see things other readers highlighted in some forms of online content (Kindle again). What if teachers who used the same content had a more convenient way to share some of their ideas for implementation? etc.