Building on https://github.com/aearly/isml-tmlanguage this version of the language definition is a replacement for the builtin HTML lang, but therefore retains all its cool features

cd ~/Library/Application Support/Sublime Text 2/Packages/
git clone git://github.com/KillerX/html-isml.git

Add "HTML" to list of ignored packages:

"ignored_packages":
[
	"Vintage",
	"HTML"
],

This should after reloading the packages give you a fully functional HTML highlighting etc, with the added bonus of ISML support, including completion for the most commonly used tags