On Friday Brad King announced on kde-buildsystem@kde.org "Repeat installations are now lightning fast", today i tried the CVS version of CMake (cmake version 2.5-20071007)
Well, it's not lightning fast, but it's a considerable win, here kdebase went from about 240 seconds to 75 seconds, so congrats to the CMake team and thanks for improving CMake in a continous way!