The KDE Project has announced the official release of KDE 4.0.
The KDE Community is thrilled to announce the immediate availability of KDE 4.0. This significant release marks both the end of the long and intensive development cycle leading up to KDE 4.0 and the beginning of the KDE 4 era.
KDE 4 is definitely a major milestone in KDE's history. New to version 4.0 are many new libraries, which help modernise the desktop and will bring more features and functionality that are usable by all KDE applications. KDE 4.0 also features many new applications, including Dolphin, a dedicated file management application and major updates to many of the existing applications.
While the new release is now stable and ready for use, the next few minor versions will see more polish added and things stabilising further.
If you're looking to play with KDE 4 right now, you might want to wait a bit longer yet. Most distributions won't be shipping it until at least the next major version of the distro, or in some cases the version after that. There are, however, a list of distributions that do have packages, and some live CDs on the announcement page.
I'll be looking at the new release in more detail probably a bit later on, but for now feel free to check out the official visual guide .