So, finally KOrganizer's bug count got down from almost 95 bugs in July/August to 44 right now. The last few weeks I was really busy producing patches at quite a rate. But every time I tested a patch, I ran into the next bug, and then the next, and so on.
But I think, korganizer is really getting into shape now for the KDE 3.2 release.
As far as I'm concerned, all the important issues are resolved / fixed (I don't know about Cornelius, and he's the maintainer of korganizer, so this list is only "unofficial"):