The list is a list of all the games people submitted to the site.
I added a lot of the games people wrote in this and the original CNN/Times list thread, but I might have missed some. That's why there was a site in the first place.
I did not add any where is was said "The Tekken series" or "The Grand Turismo games" or anything like that, because they are not a game, they're a list of games.
The whole purpose of the site was that people could add any game they wanted there, they where not supposed to write them in this thread.
All the games on the site was added by someone. All the games NOT on the list was NOT added by someone. So off all the people nominating games, noone Grand Turismo, noone added Unreal Tournement (but both Unreal Tournement 3 and Unreal Tournement 2004 IS on the list, so is Quake 3 and Counterstrike), noone added Panzer Dragoon Saga. Someone DID nominate Serious Sam, therefor that is on the list and not the others.
If you wanted those games on the list you had 5 days to add them.
I didn't make the list, people nominating games did.
EDIT: Vote at http://games.thomasmadsen.net