The new crop of HTML5 web browsers are capable of some pretty amazing things, and several of our engineers decided to take some 20% time to see how far we could push them. The result? An HTML5 port of Id's Quake II game engine!
It's still early days for WebGL, so you won't be able to run it without a bleeding edge browser, but if you'd like to check out the code and give it a whirl yourself, you can find it here. Enjoy!