I've also posted the history (or, "scratchpad") of my winning code (2012/kang) to Gist: https://gist.github.com/3909337 (possible spoilers ahead)

Okay, it is quite cryptic and a bit unorganized (as I frantically updated the code as I saw any optimization opportunity), but it may be interesting to see how the code is gradually shorten.

Process of building my entry is mostly in spoiler.html.gz. For your viewing convenience, it's also here: http://uguu-archive.appspot.com/nyaruko/edit.html

This is really awesome, thank you for sharing it.

How did you record that?

A VIM script snapshots the file every so often, and another program turns the recording into HTML. Package for both is here: http://uguu.org/arc_homura.html

Manual: http://uguu-archive.appspot.com/homura/manual.html

Fantastic. Thanks :)

A lot of your commit messages don't make any sense. Is there any point at which the program was fully functional but non-obfuscated?

More-or-less yes. I started compressing and obfuscating the code after https://github.com/dlowe/death/blob/7fcbcabb9f69bf0cdfff4651...

Sorry about the commit messages. Think of them as part of the obfuscation ;)