KDE an easy-to-use desktop environment for UNIX / Linux. KDE 4 is the next major release and it is scheduled for release on December 2007. The new version claims t make KDE faster and more memory efficient by leveraging the greater speed and efficiency of Qt 4.x and increased efficiency in the KDE libraries themselves. There is a nice review published by Korneliusz Jarzebsk:
KDE 4 is coming. Itâ€™s starting to look and behave mature enough to use it on a normal desktop. This article is a little introduction to what you might be expecting from the brand new KDE due later this year. Itâ€™s been a whole month when Iâ€™ve investigated the new environment called KDE 4. Honestly I wanted to wait till â€œBeta 3â€³, which should have appeared on 5th October. But as you all can see it has never happened. On the IRC channel #kde4-devel I was informed that the â€œBeta 3â€³ should have been tagged yesterday but unfortunately it didnâ€™t turn out to be true. Not waiting any longer I made my mind and I have updated the SVN and have run the cmake.