- Screen size : 12 Inch and up
- Processor : Intel Pentium Dual-Core,Core 2 Duo or AMD Turion X2
- Graphics : Integrated or External Graphic Card, from Intel GMA x3100 to AMD Mobility HD 3870X2
- Weight : 1.9kg and up
- Screen size : 12 Inch max
- Processor : VIA C7 1.2GHz, Intel Atom N270 1.6GHz or AMD Geode 800MHz
- Graphics : Integrated Graphic Card, mostly Intel GMA 900 or 950
- Weight : 1.1kg and below
1st, let's compare the screen size. With notebook screen size normally hovers around 14.1 to 15.4 inch, you can have a good movie viewing pleasure and don't have to squint your eyes just to see some text. With screen size 12 inch and lower, you might have a hard time typing documents in your netbook.
3rd, the graphic card. If your primary concern is playing games, you can skip the netbook altogether as their graphic are really really lame. Some claim that they install World of Warcraft inside their netbook, but with lame graphic card and small screen, how are you ever gonna enjoy playing that game. On the other hand, notebook have better graphic card than netbook even in the low-end section. They can handle World of Warcraft and other older games easily without breaking a sweat literally.
4th, the weight. This is where the netbook really shines. With their low weight (and small screen), they are truly fit the definition of portability. Thier weight are almost half of the notebook weight, which is a good thing if you're not into bodybuilding. Coupled with their power adapter, the max weight might be only 1.5kg.
In the end, it all boils down to you. Which one you prefer the most. If you like to play games or watch movies, notebook is the way to go. If you surf the web more often and type short documents, netbook is you choice. Be warned that netbook keyboard is really small and not suitable for long-term typing.