Gitorious.org is open to everyone. Its code is free software as well, so there are different options. Maemo.gitorious.org is a separate front-end that provides "filtering" of projects based on a "family" -- i.e. Maemo-related projects. Currently it looks like Maemo.gitorious.org takes Maemo Devices' official open source projects, in a way similar to Qt.gitorious.org takes Qt official open source projects.

I would say there are options as to make another "garage" front-end, make a separate gitorious server (code is there, you can run it yourself, pretty much like Garage.maemo.org is running a variation of GForge), leave all as it is, and so on.