The Greyhawk Grognard, a now-defuct but still existing blog with an amazing set of resources for Greyhawk gaming.
Blank "Absentee" sheet for when players can't make it.
The Mad Irishman's Character, NPC, and record sheets (Exact reproductions of the ones you remember from the old days!).
Wizards of the Coast at DriveThru RPG-they have brought a ton of prior edition works back for sale and even in POD format!.
(NOTE: archived page from the Wayback Machine.
Previous Edition Downloads, courtesy of Wizards of the Coast.
Dragonsfoot, the home of AD&D on the web!.
Goblinoid Games online store Labyrinth Lord at DTRPG. It's B/X (Moldvay/Cook/Marsh) D&D, not AD&D, but see below. The only one that gets the perfect reproduction of rules combined with the feel of the original. LL is, to my mind, the cream of the crop of Retro-Clone games.
Goblinoid Games, producers of Labyrinth Lord.
Knights n' Knaves OSRIC homepage and forums If anyone tells you AD&D is out of print and unavailable.they're wrong-you can buy it from the link above, with better organization, a different title, and continuing support!
The Old School Reference & Index Compilation (OSRIC).
Note: This site best viewed with the Souvenir, Century Gothic, and Fritz Quadrata fonts installed.