By "supported" I mean there is at least one book (or similar-level online resource) detailing the setting. Campaign settings I already know about for 4e: Nentir Vale (not well supported), Forgotten Realms, Eberron...
I'm interested in "supported" 4e settings so that I don't have to generate all the fluff. For various reasons, Eberron and FR are out for my immediate needs...
Just to give more clarity to "supported": Planescape and Greyhawk would be examples of campaign settings that don't seem to be supported (with books) for 4e, although older works exist.
I'm especially interested in whether there are any good 3rd party settings.