Few months ago I have touched here subject of federated social networking and gitorius sites working in such 'federated' way. Recently I have also started participating in W3C Federated Social Web Incubator Group. People from this group prepare a conference in the subject which will occur on June 3-5th in Berlin. More information on events website: http://d-cent.org/fsw2011/
Page of W3C FSW IG: http://www.w3.org/2005/Incubator/federatedsocialweb/
Wiki with lists of protocols, platforms implementing them etc.: http://www.w3.org/2005/Incubator/federatedsocialweb/wiki/Main_Page
I would really like that eventually activity feeds, commenting, merge requests etc. work across gitorious instances on different domains. Maybe some any of active developers here, interested in the subject would like to join in for this conference, and of course everyone can join the FSW group mentioned above.
With wishes of joyful coding,
elf Pavlik