Kotaku details the various pre-order bonuses you get with Uncharted 2 based on where you pre-order the game, which will be released on October 13th.

Pre-order from Best Buy for a gold-plated pistol and AK-47 usable in multiplayer games. Pre-order from Amazon.com for a map that shows the location of hidden goodies in the single-player game. Pre-order from Game Crazy for a temporary multiplier to how quickly you earn money in multiplayer games. Pre-order from GameStop for exclusive access to a multiplayer demo for two weeks in September and an unlockable multiplayer booster already unlocked. Pre-order from Game 4 Dudes for an extra ten frags added to your score whenever you play a deathmatch.

I made that last one up.