Well, the Wikis that I've seen still have a lag between editing and publishing; in many respects they are like a blog that allows anyone to publish/design. Whiteboard software comes closer to what I'm suggesting--writing spaces that are continuously updated on every logged-on system and allow changes from anywhere. I have often thought that this software could be used by visual poets or net artists to create collaborative works on the fly. Imagine something like Flash, but where everyone sees the same stage and can make changes on it. There could be a snapshot option which anyone could press that would publish the work as is--readers could view the archive of various moments that struck participants, or log into the realtime changes--and make changes themselves.