Kubuntu 9.10 rocks! 
I had been putting off upgrading to
Kubuntu 9.10 for a while now even though it's been out for a while. I had heard all kinds of horror stories about folks moving to KDE4 and not really liking it as much as KDE3. Well, I finally bit the bullet and upgraded and it kicks some serious a**!
I just selected the upgrade from within my older version and it downloaded and updated all the packages. One reboot later everything came up just fine - no hassles at all whatsoever. During the upgrade it prompted me for input whenever it found a diff in any files in /etc which was really nice. So I didn't have to do anything to setup my
Brother MFC-495cw. It was automagically picked up by the new version.
Everything so far has been quite stellar - kudos to the kubuntu team!