I think the laptop is a dying device. They will not disappear entirely, but ten years from now, you won't see them very often.
On the desktop, most of us will have something that looks a lot like the Mac mini--a very small, quiet, fast, and unobtrusive device. Or we will have something like the iMac, where there is no box at all. Windows versions of the mini are already appearing.
So where does that leave the laptop?
Most laptops will be replaced by smaller, much lighter flat panel computers that have no keyboard. CeBit, the big computer hardware expo, is , and we will see many more of these in the next year or so. Very few of us really need to lug around a laptop when traveling. These little devices will do most on the road jobs very nicely.