Xubuntu - Ubuntu Wiki: "The aim of the Xubuntu community project is to provide a nice Ubuntu desktop experience (even on older hardware) by using Xfce4 as the desktop environment and GTK 2 applications wherever possible."
I'd just kind of assumed it was Ubuntu for the XBox or something. Yes I am a bit thick.
I'm not convinced that having a seperate Ubuntu for each window manager and/or desktop environment is really the way to go, but what the hell do I know.
Looking forward to FluxboxUbuntu, E17Ubuntu, and WindowmakerUbuntu. Also, how about one that uses the Explorer shell - it could be called BSODUbuntu.