The KDE Project today announced the immediate availability of KDE 3.5.5, a maintenance release for the latest generation of the most advanced and powerful free desktop for GNU/Linux and other UNIXes. KDE now supports 65 languages, making it available to more people than most non-free software and can be easily extended to support others by communities who wish to contribute to the open source project.
You can read all about it here. Nothing new seems to really grab my attention, but over 1,200 updates are included. If you are still using an older version of KDE, it may be a worthy upgrade.