KDE SC (Software Compilation) is one of the most used desktop and application platform/environment in Linux, beside GNOME which is the default platform in Ubuntu. KDE offers high quality, slick and very nice looking, and arguably the best, highly customizable workspace and applications for its users.
KDE developers
announced availabily of the latest version of KDE software, which is KDE SC 4.9 that brings many improvements, bug fixes, new features, and the best updated release yet.
Kubuntu 12.04 running the latest KDE 4.9 (with some customization)
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What's New in KDE 4.9
