Amazon.com has a unique pre-order bonus for Uncharted 2: Among Thieves. It looks as though Uncharted 2 will have the familiar treasure system, if you pre-order from Amazon you will have a leg up on the competition.
They are offering a "Treasure Map" that indicates all the hidden locations of the treasures within the game. The map can be viewed on both your PS3 or PSP, so expect this to be some kind of a digital download.
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