D&D General 50 years, 50 products (closed, see new thread)

[TerraDave]

Moldvay Basic Set. With the Erol Otus cover and Keep on the Borderlands.

 

[TerraDave]

Cook Expert Set. With the Isle of Dread.

 

[JEB]

Spelljammer: AD&D Adventures in Space (2e)

 

[JEB]

Unearthed Arcana (1e), the final official rules expansion for the game by Gary Gygax.

 

[TerraDave]

G1, 2, 3: Against the Giants. Gygax

 

[JEB]

Planescape Campaign Setting (2e)

 

[JEB]

Player's Option: Skills and Powers (2e), providing massive customization for characters in AD&D 2e.

 

[JEB]

Tome of Battle: The Book of Nine Swords (3e), one of the precursors to the 4e rules.

 

[Whizbang Dustyboots]

Manual of the Planes (3E)

 

[JEB]

The Basic Rules set (1983), the famous "red box" introduction to the Basic D&D rules.