One of my computers runs openSUSE 10.2 and I was pleasantly surprised to find KDE 3.5.7 available.
The change that immediately got my attention are:
* Added option to change the font color used by the taskbar applet. Fixes bug 118460. See SVN commit 636638.
* Allow changing of font colors for taskbar. Fixes bug 118460. See SVN commit 636638.
* Fix various crashes on KHotKeys. Fixes bugs 115109 and 139962.
To many it may seem minor, but if you have a light window background, dark text, a dark desktop background, and the taskbar set to transparent it can be difficult to see text. This is a KDE wish come true. More info on changes here