I have been meaning to get into WebGL for a while, and a few days ago I discovered this excellent WebGL library called Three.js on Github.
Someone requested an Anaglyph WebGL Renderer for it, so I thought I might give it a try. After reading up on the code I came up with an example you can find here (NOTE: Works best on latest version of Chrome and Firefox).
The author of Three.js has already fixed my version and incorporated an actual anaglyph renderer into his code. Here is an example.
If you are interested in WebGL development I would recommend checking out Three.js.