The Orange Box was a recently released colection of 5 games:
Half Life 2
Half Life 2:Episode 1
Half Life 2:Episode 2
Team Fortress 2
The Black Box, is a famous joke sayng the Orange Box was originally to be called the Black Box but was instead called the Orange box since people thought the Black Box was racist.
Person 1:Dude! I got the Orange Box! It is consisted of 5 games!
Person 2: Um, its really only 3, Ep 1 and 2 are just like an expansion to Half Life 2.
Person 1:Hey! Did you know that it was going to be called Black Box but they thought it was Racist!
Person 2: Laughing Face!
The Black Box/The Orange Box