Mythic Europe (the Ars Magica setting) kinda blows.

Call me vanilla. I went with Forgotten Realms.

I went with Dark Sun... Always wanted to try that in 3.x or some variant thereof (as usual borrowing rules from Star Wars by way of UA... maybe add some Iron Heroes).

Same goes for Spelljammer, Planescape, and Ravenloft. They all seem like such distinct settings. So different.

Whatever half-assed species of fantasia generica the GM happens to come up with.

Mystara.  Hands down.  :cool:

I voted Greyhawk, but Planescape was nifty, too. The former is vanilla D&D (despite now being mostly ignored). The latter allowed for unlimited toppings in a never-ending waffle cone. Together, it's the best of all worlds (and puns).

Record of Lodoss War, which began as a D&D campaign:




If not, either homebrew or Forgotten Realms. I never had enough exposure to Greyhawk.

Quote from: susan deathI always thought it was a shame that they never went for a game like Ars Magica, with strong historical roots, but which played like AD&D.
 Of course, setting conversion is why we're gamers!

For AD&D 2e, TSR produced

HR1: Vikings Campaign
HR2: Charlemagne's Paladins
HR3: Celts Campaign
HR4: A Mighty Fortress Campaign   
HR5: The Glory of Rome Campaign   
HR6: Age of Heroes
HR7: The Crusades

I kinda suspect these were a reaction to similar products that were made for GURPS, Runequest, and RM/HERO (remember when ICE made a bunch of dual-system supplements for their mismatched games?). A cursory look at RPG.net turns up quite a bit of love for HR4. I remember seeing HR2 on the shelves and being moderately interested; more recently I saw it in a used book store and gave it a good look, but I just didn't see much of a good history:game interface. I.e., encyclopedia-level overview of the period from a historical and legendary perspective, but then very little to concretize it into game terms.

Planescape, for the sheer versatility of the setting, and the fact that they never produced a single bad sourcebook for the setting. I like using Planescape to tie the other settings together.

Quote from: JongWKRecord of Lodoss War

At least you're honest!!!11!

Quote from: JongWKRecord of Lodoss War, which began as a D&D campaign:




...

Anime + D&D add a computer to the equation and the result would be heaven for me.

For me, it's Ravenloft, but I also have to agree with Jong that Lodoss, from the scraps that have been translated, appears to be a lot more interesting than any generic fantasy setting ever published for D&D.

For me, I suppose it was either the Scarred Lands or Kingdoms of Kalamar (2e boxed set, as opposed to 3e hardcover). The former screamed "Play me!" and the latter was a nice change of pace from all of the over-powered high magic dripping from TSR's official settings of the time.

Quote from: Elliot WilenI.e., encyclopedia-level overview of the period from a historical and legendary perspective, but then very little to concretize it into game terms.

I agree with this assessment, but of all the books in the HR series. I like all of 'em (I bought all 7 as they were released), but most of them seem oddly reluctant to really translate the material into a game setting. Some move in that direction more than others - the Viking book is perhaps the best example. Still, they make for decent sourcebooks for those who want to run relatively realistic campaigns set in historical places. Their biggest flaw is that they err on the side of being safe.

Anyway. Favorite D&D setting. Tough call for me. I'd have to say Greyhawk, the pre-From the Ashes version. It was a good, solid place to run a campaign, and the various early modules set in Greyhawk really helped give it flavor. However, I really, really liked Al-Qadim, the initial sourcebook of which is really damned nice, and Birthright, because it had such a distinct look, feel, and main concept.

I liked playing a pc in the old boxed (early 80's?) Greyhawk, with the big fold out color map,  but I don't believe I've ever run a licensed setting for D&D. Thinking on it, I realize that as much as I played 1e as a kid, and into college even, I've hardly ever run it or any other iteration of the game, in a licensed setting or otherwise.