KDE 4.3.2 brings a nice numer of bugfixes, some critical, some just fixing small annoyances:

* Many crashers have been fixed in KDE's core libraries, bringing more stability to all applications
* KWin's window compositing effects have been further stabilized by fixing a number of bugs in effect plugins such as the famous coverswitch window switcher
* The biggest number of bugs for this release has been fixed in KMail, KDE's email client, making it more reliable and usable by correcting a number of display issues
* Saving files over themselves works again in Okular, KDE's document viewer

As usual, the changelog provides more -- if not exhaustive -- information about improvements in KDE 4.3.2. The KDE team recommends KDE 4.3.2 for everyone running an earlier version of KDE.