Collaborative Editing

I'm an enormous TextMate and emacs fan (been using emacs since the late 90s and have fought a good fight in the vi vs emacs battle front ;) ), but I would shift over to Textstatic in a heart beat if you'd facilitate collaborative editing for us.  I find myself *frequently* wanting to collaborate with other members of my team and family in various coding and simple text editing projects.  I am not very fond of existing solutions that I've evaluated and would very much like to see something that brings the goodness of TextMate into this realm.