In the following gallery you will be shown just how easy it is to download JSC, install, create a WebGL application (see the original) and run it in your WebGL enabled browser.
Would you want to program your shaders in C# instead? It would look something like this once implemented:
Update: See GLSL overview
Update: See WebGL Awesomeness
More examples: Shadertoy and Collada tron tank
More examples: Chocolux and take screenshot from 3d and Cubepaint
More examples: Raycolor and more and some dancing frogs? and a whale?
Shortest WebGL example
More examples: Ethanol
Update: GLSL minifier, and a small c++ demo
Can we port XNA to WebGL?
Update: For debugging and see WPF OpenGL.
Update: Photoshop effects
Update: Can we have COLLADA within HTML?