This weekend after wanting to have one for about a year, I finally got a laptop (iBook G4 12").
and my first reaction is WOW what a nice piece of hardware... after playing with macosx for about 45 minutes, the call of Linux was starting to be too strong ...
So i decided to install gentoo, after sometime (ok I cheated I installed from stage3), i got a working KDE system ... and it's fast and stable ...
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KDE on OS X
Ya know, I bought an iBook G4 12" last year as well, and decided to stick with OS X. I still got KDE, however, thanks to Apple X11 and Fink, which is a port of the Debian toolset/packages to OS X: http://fink.sourceforge.net/
Basically, I have KDE/X11 windows happily running side by side with the OS X apps.