An alternative, of course, is to simply ditch the whole idea and move
any projects people are interested in maintaining collectively into
their own GitHub orgs, such as http://github.com/luasocket/luasocket,
and be done with it. What exactly do we gain from having a common org?
The only ones I really see now is: (a) promoting a culture of
collective maintainership; (b) more visibility to new projects due to
being next to well-known ones in the same repo (with (a) of course
being the important one).