I found an interesting video by the design firm IDEO. It shows their 3 concepts for the future of digital books.
I just watched the video, and a couple details struck me as rather odd. I can't recall the last time I saw a video that showed active collaboration on a concept ereader. Do all these designers assume you will only create content computer, not an ereader? The other odd thing is that the collaboration abilities of most of these concept ereaders are actually less than what you can do right now with a tablet. Concepts aren't supposed to be behind the curve, and this one is.