The plugin is in ECF CVS, and is named
org.eclipse.ecf.example.collab.editor. Not sure if attachments
can be sent to the maillist so I'm posting the screenshots here:
Clearly this is very rough still but is I feel in some primitive sense
usable. Note that it's only currently working for text
editors. I'm still in the process of getting it to work with the
Java editor. Let me know what you think!