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It is important to note that the KDE netbook desktop is included in every KDE 4 installation — but it is not the default, so you have to activate it if you want it. It works brilliantly on every netbook I have tested, with complete support out of the box for all the hardware including Intel Atom, AMD C-50, C-60, E-350 and E-450 CPUs, Intel and AMD/ATI graphics, Intel, Broadcom, Atheros and Ralink network and Wi-Fi adapters, and as little as 1GB to as much as 4GB of memory.
Although I have chosen openSuSE 12.1 for the screenshots here, I could have done the same thing on Mint 13 KDE, Mageia, or any other current KDE 4 distribution.
To activate the KDE netbook desktop, go to the KDE menus and select Configure Desktop to get to the control screen where you can choose the netbook desktop.
In the Configure Desktop window, select Workspace Behavior to reach the control where you can toggle between the Standard and Netbook desktops.