A ultra portable notebook or laptop is really just a small portable computer that weighs 2.0 to 10 pounds on average and that depends on its brand, style, size, material it is made from.  Notebooks generally operate on a single main battery or through the use of an external adapter that can both charge the battery and supply power to the notebook when near an electrical outlet.

Notebooks are used for performing the same jobs that a desktop personal desktop perform; the only difference is that they are generally less powerful for the same cost. They consist of similar but comparable components like desktop computers and execute the same functions, except that they are miniature in size and perfect for transportable use and effective power consumption.
 
Notebooks usually have LCD screens and different memory modules. They have a built-in keyboard; input is done through a touchpad or a pointing stick, though an external mouse can also be used.

There are different classes of notebooks.  UMPCs are Ultra-Mobile PCs and are very light and portable. Since they are of a small size they can fit in a small touch screen while some other models have a compacted keyboard along with a mouse interface.
 
The other type is Ultraportables which are notebooks and have screens less than 11 inches (usually 10.3in) and weight less than 3.5 pounds (1.6 kg) of weight. They are generally used by business professional who travel a good amount of the time, as they are small and light though very expensive.  They usually have an extended battery life and integrated graphics. The other type of notebook is the Sony VAIO FJ76, and Dell XPS M1330 and XPS M1210.
 
Then there are the mainstream notebooks that are more of budget desktops shrunk down to fit in your briefcase. And if you want desktop power, then you can opt for a desktop replacement class which can accommodate many performance components needed for desktop class speed.

As far as the processors are concerned you should go for the fastest that your budget will allow. You can opt for Intel`s Centrino that has great speed and also good battery life. Or else you can also go for the less costly AMD`s mobile processors whose performance still lags behind Intel for mobile class processors.
 
If you intend to watch DVDs on your notebook then go for wide screen ones that offer crisp, sharper, and great image quality. The only consideration is that they are not meant for carrying around a lot and DVD movies tend to eat up battery life compared to normal computing tasks.

For great system performance it is vital to have enough memory (RAM) that will allow you to run many applications together. Plenty of RAM is also essential for image and video editing, graphics work, and 3D gaming. Generally notebooks have a terrible sound quality through their internal tiny speakers, so it is recommended to use external speakers or headphones. These are some of the factors that you need to consider before buying a notebook.

Also keep in mind that like all electronic device, your ultra portable notebook is vulnerable to accidents as well as system failures. It is recommended to get at least a three year warranty and also some additional insurance if you are buying a professional or business class machine and plan on having it for that time frame.

Some of the famous brands that we offer here at www.ultrasmallnotebooks.com are Acer, Compaq, Samsung, Lenovo, Toshiba, Dell, NEC and Panasonic.