Many distros have their own setup tools; SUSE's YaST is so all-powerful that SUSE users probably have little reason to run the KDE Control Centre at all. Most of the other distros, such as Kubuntu, have realised what a great tool it is and rely on it for most configuration tasks. Kubuntu has incorporated it into its own setup menu, which you can access using the spanner (wrench to American cousins) button on the panel.