I can imagine laptops the size of a PDA, but with a roll out screen and keyboard.
Thanks to OLED technology, it is possible to manufacture a screen that you can roll up like a piece of thin plastic, right now it's still in the developing stages, and only being used commercially in certain cell phones.
So I can imagine having the processing/hardware in something the size of a pda, and the screen can unfold and you can stick it on a wall, or the surface of your desk, and unroll a touch sensitive keyboard, that also looks like a piece of plastic. Probably will stick to the normal mouse for input for the near future, as it is the most efficient and accurate way for cursor control IMO.
But yeah, look up OLED technology, imagine having a newspaper that is a big led screen you can roll up and just download the news to it everyday for a couple cents. (edit: if you remember in "minority report" on the subway, you can see some people reading a newspaper with moving graphics etc, that's basically what OLED promises to do in the future.)
THE FUTURE IS NOW *makes weird scifi noises*
2nd EDIT: look at http://www.oled-info.com/
oh yeah, they also use less power, are lighter, brighter, better contrast and USE LESS POWER!!http://www.dynamism.com/vz-90/