Have almost finished the replacement of Gentoo on the server/workstation with Kubuntu Intrepid. Reasonably straightforward install. Keyboard seems to have been mis-identified, so I don't have a down-arrow, end or home key until I reconfigure the keyboard for each login. I've seen one crash that appeared to be the nVidia drivers not wanting to go into "overlay" mode to view a test movie. Wound up fighting networkmanager for quite a while to try to get a static IP even when noone was logged in, eventually just ripped NM out and configured a static IP.
Need to get backups re-configured, but other than that and the keyboard issue, we seem to be finishing the race with just a single day of lost productivity.