Looking at the list of categories here on Eduforge.Org I think there are a few others that would be reasonable as well: "Real Life" and "Moodle" both seemed to be missing, so I've added them. "Debian" is conspicuous by it's presence in the list, and no doubt I will be using that one in due course...
In fact why not talk about Debian now. And Ubuntu. And how the two projects are having interesting effects on each other. At Debconf5 recently Mark Shuttleworth gave an interesting talk where he tried to present his view of the interaction between the two projects.