I've made the transition from KDE 3.x to KDE 4.x. Here's a shot of my KDE 4.1.4 desktop on FreeBSD 7.1. It's a little cluttered, but I'm trying different things right now.
The desktop theme is
Arezzo
Weather applet is
yaWP (I ported it, but its not in the ports tree yet (
http://www.freebsd.org/cgi/query-pr.cgi?pr=130596)
Music applet is
am3rok (I ported it, but have not submitted it hoping Amarok 2.0 will hit the ports tree soon. If you're interested in the shar, it's attached.)