Ok so I downloaded the Kubuntu KDE4 cd image earlier, and because I couldn’t find, nor be bothered to erase a CD to burn, I ran it in a Virtual Machine using VMWare.
I think it’s really good, I’m not a fan of KDE anyway, but it looks very nice, and I think the widgets could help Mac users migrate to Linux. Problem for me is that it reminds me a lot of Vista…you know, that ‘new’ OS from Microsoft .
Anyway I’d still say that it was definitely worth a look 
#1 by Ubuntu For Free on January 14th, 2008
I think KDE 4 will take a little evolving for users interested in using it for the long term. It’s interesting to see that you’re drawing comparisons to Vista. I thought it was a pretty good departure from the Microsoft Windows style. It’s clear that they’ve superseded the developments on the interface. I don’t think I’ll ever be satisfied with Dolphin, when I compare it to Konqueror.