This is well worth checking out for programming language geeks and web technology geeks alike.
Kevin Gadd has posted a project to his GitHub account called JSIL.
It compiles C# code to JavaScript code that is runnable in a modern browser. Furthermore it wraps the XNA framework for game development on PC and Xbox, allowing the graphics to be rendered to an HTML5 canvas.
He has also compiled the XNA Platformer Starter Kit example which ships with XNA and it is playable in your browser right now.
Imagine writing a single codebase and deploying to Xbox, PC, Windows Phone, and HTML5…