A Concept Art walkthrough

Not related to the unit or work but still interesting. I just preordered a special book detailing the entire development of the game 'Uncharted 2' for personal and uni use as it goes from concept to final product in great detail as well the art of the game. When I preordered it I was given a download link to this. Its a video with various concept art walkthroughs from the team in great detail. Its 22 minutes long (skip along if you want) with no sound but really shows what goes into making a fantastic piece of concept art.