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As notebooks shrink in size, so do their keyboards. If possible, try some simple typing exercises before you buy it. The smaller the keyboard, the more creative the vendor may have been with key size and placement. Pay particular attention to the space bar, Shift, Ctrl and Backspace/Delete keys. Be sure that all are in good locations for your hand size and typing style.
Vying for video RAM
With the introduction of Intel HD Graphics on Core i3 processors and above, the bar has now been raised enough for integrated graphics to suit most peoples' needs. If you want to play games, though, you'll need a dedicated GPU — try to grab something with 512MB to 1GB of video RAM. Ignore the salesperson who insists that video memory is an indication of performance; while larger video memory does tend to be paired with higher performing cards, it's not the thing that's primarily responsible for the performance increase.
Keep an eye out for backlit keyboards, as well — these help immensely when typing in dim light.