The Current AD&D Campaign Worlds:

TSR
Generic
Al-Qadim
Birthright
Dark Sun
Dragonlance -separated from AD&D
Forgotten Realms
- Oriental Adventures (Kara-Tur) -discontinued
- The Horde -discontinued?
Greyhawk -discontinued
Lankhmar
Mystara
Planescape
Ravenloft
Savage Coast
Spelljammer -discontinued.
The worlds of the Historical References:
- Celtic campaign
- Charlamange's Paladins
- Europe, with gunpowder
- Greece
- Rome
...and the many worlds of DMs

Corrections needed? Ideas? Suggestions? Comments? Submissions? mail me! I love receiving feedback! Please mention how you found me, your URL, and comments.