I watched a video from YUIConf 2012 in which Douglas Crockford gives a talk about implementing monads in JavaScript. In this talk he gives a code example that utilizes what he calls "Context Coloring" which throws out the idea of coloring by language syntax and introduces different colors for different levels of scope. Here is the link to that specific part of the video.
http://www.youtube.com/watch?feature=player_embedded&v=dkZFtimgAcM#t=15m58s
Is this context coloring scheme implemented by any code editor for JavaScript or any language?
I use Sublime Text and this editor like every other code editor I have come across allows color to be applied to syntax. Im not sure if a plugin could solve this problem or if an editor would have to be designed from the ground up to allow this context coloring scheme.
As of Feb-13th 2013 Crockford has added an experimental context coloring feature to JSLint.
https://plus.google.com/118095276221607585885/posts/FzKnHk96m2C