Hi there! It's done! I'm at ~x86 now. The upgrade went quite smooth - had to resolve some blockers, and mask the new x.org 1.7 because it does not work at all with ati-drivers.
**BUT:** After rebooting, I ran into a very nasty KDE4 bug. All authentication dialogs did not work. So I had no KDE wallet, no kmail, no kopete, no webmail... now this was annoying! Must be some strange side effect, I do not think anything of KDE itself had been updated. I spent quite some time trying to solve this. Without an existing ~/.kde4 directory, it worked, but all of my .kde4 backups (I have lots, I make one whenever I save the session, because this does not work sometimes) had the problem. So I searched for the file in ~/.kde4 that was responsible for it, and finally I found .kde4/share/config/kdeglobals. And, more prrecisely, this setting: [Passwords] EchoMode=ThreeStars I commented this out, and all is working again. Yes, I will file a bug report upstream. This kind of bug is what made me not switch to KDE for a long time. The possibility of suddenly having a little problem which makes the whole KDE thing unusable until solved. Wonko