This is great stuff. When I was working on a platformer I'd read a lot of the code for these classic games (Mario, Metroid, Sonic, Megaman, etc.) to see how they did platforming and what the character physics tuning numbers looked like. I've been meaning to do a series of articles that break down games, focusing mostly on gameplay code, enemy behavior and physics. The only comprehensive article I've found like this is the Pacman dossier (http://home.comcast.net/~jpittman2/pacman/pacmandossier.html). Everything else is random bits and pieces that can be pieced together, but would be nice to have in one place.
Sonic Retro has a writeup of the physics behind Sonic 2. Check it out, it's exactly what you're looking for and would be a good template to follow for other games.
I'd love to read such an article. Platformer physics can be very fiddly and there are a lot of small variations that have a significant impact on "feel".
