The XO laptop I received last week as part of the One Laptop Per Child (OLPC) Project's "Give One Get One" (G1G1) promotion is unlike any other laptop I've ever used, both in appearance and functionality. It's smaller, for one thing. The XO weighs only 3.13 pounds, is 9 inches wide, and approximately an inch thick when closed. But there's a lot more difference between the XO and a normal laptop computer than size.
It has strangely marked keys, unusual buttons, external wi-fi antennas, a unique UI, and an original reason for being. Most people, myself included, will compare the XO to normal laptops, but that's not a good comparison. The XO is not designed to do the things that most notebooks are called upon to do, and no other notebook in the world can do the things the XO can do. There is some overlap, of course, but in the main it's apples to oranges.