Forgive my ignorance of KDE 3...what is ktemperature used for? Was that a KDE app that managed your cpu scaling and reported temperatures? If it was, I just use cpu-freq. After installing it I just use a terminal window and as super user type "cpufreq-set --governor ondemand", which scales all the way down unless demand for CPU is higher and then it scales as necessary. Along with the proprietary driver my machine stays more than 20C cooler.
If that's another app not related to this response, please disregard.