I've seen a lot of chatter about digital paper. And I'm excited. I'm easily excited about newfangled technologies.
But people are really freakin' dumb. They're talking about how nice it will be to hang it on the wall instead of having a TV, which is just the least appropriate use ever. Slightly more valid, they talk about how nice it will be that laptops will be so much lighter...
Um, yeah, it would be a perfectly valid use to make laptops lighter. If there were going to be any laptops.
But, sorry folks, digital paper actually kills the laptop. There will be no laptops once digital paper is perfected.
There are only two reasons to have a laptop instead of a PDA. 1) better hardware. 2) better IO (bigger monitor/keyboard).
Digital paper solves the second one flat out. When you can roll (or even better, fold) your screen into arbitrarily smaller sizes, the idea that you'll carry it around in a laptop-sized case is stupid. You'll carry it around in an ipod-sized case. More likely, you'll carry it around as a bracelet/watch which has basic functionality when on your wrist and is a full touch-sensitive screen when it is unfolded to its full square foot of glory. (That should be read in a Strongbad voice. "UNFOLDED TO ITS FULL SQUARE FOOT OF GLORY!")
Digital paper doesn't have any computation built into it, at least not in the forseeable future, but that doesn't mean that you'll want a laptop-shaped device to provide for serious hardware. There are many other shapes that are at least as good, including the idea of several small, wearable devices that contain specialized computation and network. Any way you run it, "laptop" isn't going to be there for you. We'll probably come up with a new name for it, like "black boxes" or "minicomputers" or something. "Weenies", if you buy the Nintendo version. They won't have screens, they won't have keyboards, they won't have speakers.
Laptops are going to be killed, but don't worry: nobody will miss them. Just unfold your watch, prop it up with the microframe, and get to work.