I voted "Other 3rd Party Setting". My favorite published D&D setting is Dave Arneson's Blackmoor. I love the fact that in Blackmoor mankind is huddled in scattered villages, on the brink of disaster. The very land is dark and eerie. There are no mighty kingdoms or vast city-states. Its small habitations are hewn out of the ever-encroaching wilderness. The world of Blackmoor is even less populated than the sparsely-populated Wilderlands. The largest city is Maus, with a population of a mere 18,800! The "city" of Blackmoor itself has a mere 5,400 inhabitants. Existence is precarious in this frontier land, with rumors of invasion and realities of magic and monsters threatening to overwhelm human civilization. A glance at the Blackmoor map will reveal that Blackmoor is a very wet, marshy land crisscrossed by many rivers and channels. D&D doesn't get any better than this. One can tell that Blackmoor is a real, living campaign. It wasn't designed and slapped together in a few months. This world has been chugging along for well over 30 years.