"Laptops are not mobile. They are nomadic." -Nicholas Negroponte
I spotted the above quotation in a Wired magazine article about the tablet as the future of computing. I don't have a ton of commentary on it, because it largely speaks for itself, I just wanted to share it as something to think about.
Perhaps as proof of the concept, I read the article and am writing this post on an Amtrak train, where I wouldn't dream of trying to balance a laptop on the plastic tray tables, but I can easily envision using an iPad or something similar.