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Wireless lan :
Wireless lan of wi-fi as it is commonly called these days is getting very popular .But the popular misconception is that once you have a wi-fi you can connect to internet wirelessly without any additional accessories which isn't true. Wi-fi only means the capability to connect wirelessly to your local area network which too will require additional accessories like Wireless router oraccess point .Wireless comes in three speeds ( the speed with which u can access your local area network) and are represented by differentletters. The least of them is 11 Mpbs written in spec sheet as 802.11b, 'b' indicates it supports up to 11 mbps , next is 54 Mpbs and written as 802.11g , 'g' indicating 54 Mbps speed , now by firmware upgrade speeds up to 108 Mbps can be achieved usually laptops don't come with 108 Mbps speed. All these are mutually compatible meaning you can have one laptop with 'b' standard card and other with 'g' standard and they will still work on a network .To understand wi fi in detail
Weight :
Another very important consideration . The weight of a laptop is inversely proportional to the price .The lighter the laptop the heavier it is on your pocket. Heavy laptops usually are loaded with features and are made to be desktop replacements .The major weight adding components are the processor and the size of the screen .Usually the normal Pentium 4 based laptops are very heavy due the amount of the heat sink material. that goes along with it .The latest mobile series of processors like the Pentium M processor are madespecially for laptops and are lighter in weight. The screen size also adds to the weight. Usually laptops weigh around 2.5 kgs , the heavierones weigh around 3.0 kgs , and the lighter onesweigh around 1.5 kgs.
Screen :
Most screens sold today are TFT active matrix LCD screens. TFT active matrix is a technology in which each pixel has a transistor attached to it to control the backlight shining through it. Each pixel is made up of 3 sub-pixels (red, green and blue) with each having its own transistor. Each of these pixels turns on and off and filters light through colored sub-pixels which results in an image. The more pixels or higher the resolution a screen is the crisper the image. In addition, higher resolution screens allow more of an image to be viewable.
Laptop screens are usually of the following sizes (in inches) 12.1, 13.1,14.1, 14.4 (wide screen ) , 15, 15.4 (wide screen) , 16, 17 .You may take a screen size of your choice , the advantage of choosing a larger screen is in terms of the resolution support you get on them , to state , the bigger the screen the higher resolution it supports .More than the size of the screen it is important to see the brightness and the resolution aspect ratio .Most manufacturers offer bright screens at a premium. They have different names xbrite in sony ,Clear Super View (CSV) in Toshiba etc. Here are two charts below that tells you about screens sizes and resolutions
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