Three weeks ago I gave a talk at Google on my real-time shared editing project, which in its first incarnation materializes as a set of eclipse plug-ins.
A couple of posts on Google's Open Source blog and my blog respectively provide a little more insight concerning the event at which I presented the algorithmic details for the first time. http://google-opensource.blogspot.com/2008/06/eclipseday-at-googleplex.html http://codesurgeonblog.com/2008/05/eclipseday-hosted-by-google-attendee.html
If you don't care too much for the inner workings but would rather like to see the shared editing in action, I have put together a screencast, available via http://www.vimeo.com/1195398
Real-Time Shared Editing - Google Tech Talk
youtube.com