Those are for Sublime Text 1, rather than 2, by the way. The API for Sublime Text 2 is very similar, but different enough that plugins won't work without being changed.
Documentation for Sublime Text 2 is extremely thin on the ground at the moment, it's something I'll try to address soon.
Community page of existing plugins for Sublime Text 1. Hopefully these get ported to 2: http://sublime-text-community-packages.googlecode.com/svn/tr...
http://www.sublimetext.com/docs/api-reference
http://www.sublimetext.com/docs/plugin-basics
http://www.sublimetext.com/docs/plugin-examples
(EDIT: API is for Sublime Text 1 only)