I've been trying to figure this out for a while. How does he do his awesome landings? I.e. flipping around and ending up almost balanced at the end. It's crazy cool.

Well, he does a move. It almost lands properly. Then, he goes back and edits his replay. (pressing e during the replay, I think...) When he does that, he shift+spaces through, to make the frames move in ones. He relaxes several muscles to make it work, and much of it is also knowing the game as well as he does.

Any one of us could do it, but he does it best.

I guess that because he made the game and made all of this possible that he should know how to make super replays! I will also try the replay edit thing too :P