KDE 4.3.0 is out, and it is a great release. It is unlikely that any one specific thing will strike the user as the most noticeable improvement; rather, the overall user experience of KDE has improved greatly in KDE 4.3.0. The release's codename, Caizen, is a Japanese philosophy that focuses on continuous improvement throughout all aspects of life. That has been the goal of the KDE team for 4.3.0: polish, polish, polish. The statistics from the bug tracker speak for themselves: 10,000 bugs have been fixed.
Read the full thing at http://dot.kde.org/2009/08/04/kde-430-released-caizen
RPMs for Mandriva have already hit the Cooker mirrors.