Segment #2: Thin and light
When was the last time you used your floppy drive? When you possess a CD-ROM or network connection you will hardly need it at all. So why carry it with you?
Thin and light notebooks carry one to two drives inside and weigh less the 2kg. The missing drive(s) can be attached to the notebook with a proprietary connector or via USB. Display and battery would add to the weight of any notebook, so both are stripped down too. 8.9" to 13" displays and less battery cells than an all-in-one notebook are used. Some of those ultra light notebooks use displays with non-standard resolutions like 1024x480 to get the notebook smaller in size and weight.
Segment #3: Meganote
Meganotes are desktop replacement products for the small and prestigious high-end market. Every little gadget and gismo that is available for money can be found inside, including large 14" to 15" displays with very high SXGA+ 1400x1050 or UltraXGA 1600x1200 resolutions.
CPUs of 800+ MHz, memory sizes above 256MB, wireless LAN, DVD and huge 30GB hard drives in combination with the large displays don't come cheap. This is a notebook for the desk of a manager to show off or a real power user. Most road warriors don't like carrying such a heavy and expensive device around.