The Hidden Blade Assassin's Creed in Depth

Since there is ROB_88's thread for things that makes you laugh, I figured this topic could be for videos (or others) that you like for other reasons than humour.
I discovered this masterpiece recently, and was blown away at how extremely well done it is. I thought this is the kind of thing that must be seen at least once :
http://www.youtube.com/watch?v=7IKMch3kpR0