After some good impressions with the new Arch Linux installation (with LXDE and XFCE and also Gnome), I decided to give KDE 4.2 a try on Arch Linux. The installation with pacman is easy. The result seems to be better than both Fedora 10 and Ubuntu 8.10.
Now I have a problem with KDE 4.2 under Fedora 10 that console-helper will hang during startup with a dialogbox titled "Query" when I tried to run programs like yumex or other programs which require root access. Logout under Fedora 10 is also very slow compared to others. KDE 4.2 under Ubuntu seems to be a bit more smooth but the login/logout are both a bit slow compared to Gnome.
KDE under Arch seems to better. The logout process is faster than both Fedora 10 and Ubuntu 8.10. Still various program will still come out many warning messages. This is across thee distributions I tried KDE 4.2. So it seems to me KDE 4.2 is not ready for prime time yet. But it is promissing. I did not like KDE 4.1 under Ubuntu 8.10 at all. Nor did I like previous KDE 3.x under Ubuntu. Now KDE 4.2 at least gives me some incentives to try out KDE again after using Gnome since I re-discovered Linux back in 2005 with Ubuntu 5.04. Before that I tried various Linux distros (Slackware, Redhat, Mandrake, Caldera, Corel, etc) on-and-off from 1998 to 2002.