KDE 3.2.3 is available for Slackware Linux 9.1
Unofficial Slackware-9.1 packagesDownload
kdemultimedia needs the package taglib
kdegraphics needs the package lcms
Installation (For people that doesn't want to read the Slackware documentation...)
First remove the old packages with the "pkgtool" utility. There are all the kde* packages, arts, qt, kdevelop, quanta and koffice. Then install the new packages with pkgtool or installpkg with_package_name.tgz