Ubuntu
Yes, thats right, I am a Gentoo developer with an Ubuntu page on his site. I have used Ubuntu as a server for a while at work, when I needed to quickly stage something and didn't want to go through the effort of building a Gentoo based server (however for production they went to Gentoo simply due to the USE flag control) - recently, I installed Gutsy on my desktop system in a triple boot configuration with Gentoo and Windows - this page will have various info as I collect it for future reference. 