Same with commented disassemblies of Super Mario Bros (https://gist.github.com/1wErt3r/4048722), Super Mario Bros 3 (http://sonicepoch.com/sm3mix/), and Legend of Zelda for the NES (which I can't find right now, but think I probably have a copy of around here somewhere...).

There are some Sonic the Hedgehog ones too: http://info.sonicretro.org/Disassemblies

I love the idea of reverse engineering games as a sort of "software archaeology", as well as a method of preserving them in the future.