I just tried the openSUSE KDE 4.1 Live CD and I have to say I'm much more happier with 4.1 than I was with 4.0, almost to the point where I won't have any gripes when Mandriva makes it the default for the 2009 release in October. However, a few things kind of annoyed me a bit:
1) Double-clicking the top-left corner of a window no longer closes it. It's now just like GNOME, which is unfortunate, and I couldn't find a way to change this behaviour.
2) I couldn't find a way to turn off shadows under icon text on the desktop (when I moved icons out of the folder-view and copied them to my desktop so that I can willingly have the "icon mess" I feel pressured to abandon). The only way I could find was to change the theme, but I'd prefer dark rectangles behind icon text so that I can easily read the text.
3) Will there be a way to minimise KDE PIM to the systray? I don't want it hogging a taskbar space but, just the same, I still want it open and I'm so used to this behaviour in Outlook and current Kontact (though, I have to click on the systray icon to minimise Kontact to the systray in KDE 3.5). A preference that says "minimise to system tray" would be totally killer!
I'm confident these things will be fixed eventually, but maybe there are solutions now that I don't know of?