I wanna know how they did the physics, and drawing stuff at wierd angles, esp. the video.
Well, for a start, they obviously collaborated with YouTube to do this, so they probably had access to things that most people wouldn't. So that's cheating. =]
But I guess each element of the YouTube page is able to be contained - think a well formatted html page linked to a css file. Ninty have then gone and implemented each section into a flash environment and then flash animates each section with some rediculous physics.