OPML Editor support: Welcome to the OPML Editor
Dave Winer did not write Symantec's MORE 3.1. He had a big role in its genesis however, so the man has serious Outliner cred. (OmniOutliner Pro is the true heir now to MORE 3.1).
Now he's returning to the world of Outliners. I hear this is pretty raw, but I'll give it a try sometime. Maybe then I'll figure out what it is!