KDE 4.0 is doubtlessly the most discussed KDE release at the moment. Some praise it, some don't really favor it. But whether you're going to like it or not, it's worth to, at least, give it a try.
If you use OpenSUSE 10.3, installing KDE 4.0 is very easy, it's just one-click away! Simply click on the following icon:
Wait few minutes (or hours), then you'll get the desktop:
Update: and add some plasmoids to get something like