A few days ago, I watched a video demo of the “SI Tablet”, a new eBook device developed by Time, Inc. and The Wonderfactory. It demonstrates how a touch screen, portability, and the convergence of text, audio, and video can create unprecedented opportunities for content providers. Frankly, it is the most compelling media device I have seen yet.After watching the video several times, I have come to a few tentative conclusions about the future of book publishing.