Opinion:
I like KDE.
Oh, well, I like gnome as well, but given the choice, I'll pick KDE each time.
Now on to more important things.

KDE Themes
Here are some Fermilab based KDE themes. These will work for both KDE 1.x and KDE 2.1.x.
And of course, if you want others you can go to kde.themes.org and/or kde-look.org

Install KDE
For those of you who want an easier way to install KDE

More Opinions and thoughts:
Over the past couple of years of using KDE, I've seen it move from something that is a nice alternative to your primitive X windows, to something that I really prefer over the MS Windows desktop. I'm not just saying that because I like Linux, I really do feel that way.