HowTo: The Instant Outline Tool
http://howto.opml.org/dave/editorOpmlOrg/instantOutlineTool.html#prerequesites
"The Instant Outline Tool for the OPML Editor allows a group of people to communicate using an outline to reflect each person's status. You have two windows -- one where you edit your outline, and the other where you view the outlines of all your buddies, the members of your workgroup."
instant outline beta - FriendFeed
http://friendfeed.com/rooms/instant-outline-beta
"A room for testing the first Instant Outliner release."
Before There Was Twitter, There Was Dave Winer’s Instant Outliner « I’m Not Actually a Geek
http://bhc3.wordpress.com/2009/01/16/before-there-was-twitter-there-was-dave-winers-instant-outliner