The folks behind the popular KDE Linux desktop environment pushed out version 4.4 recently, complete with a new interface designed specifically for netbooks. Basically a desktop environment such as KDE or GNOME provides a user interface and a number of applications for Linux users.
The KDE 4.4 Plasma Netbook shell is optimized for mini-laptops with small screens. It has a full-screen application launcher and search utility. You can use widgets to display content from web sites in a newspaper-like layout. And there’s also an emphasis on integration with social networking sites.
KDE 4.4 is a desktop environment rather than a complete Linux distribution. That means you should be able to use it with a number of popular Linux distributions including Ubuntu, Fedora, Mandriva, or PCLinuxOS, although the installation methods will vary by Linux distribution.
via Engadget
KDE is also available for Windows, but it is only version 4.3.4
https://windows.kde.org/news.php#itemKDE434forWindowsavailable