Fresh from the clogged tubes of teh intarwubs…
"In the United States, we have two thirds of American households as active gamers. This is what people are doing with a significant amount of their time, and if people in the future are going to understand what this society is like, they need to understand gaming. And how people gamed.<br />
You also can't understand some other parts of our cultural world unless you preserve some of the game world. There's a lot of sort of interpenetration of media. On the importance of preserving a game like Doom—well, if you're preserving something like The Simpsons, you're not going to be able to understand the Doom references that they made visually in a few Simpson episodes unless you've got a copy of Doom sitting around."