I've added SSAO (with optional blur) and fixed a few bugs. There is a small panel to toggle the effects (shadows, SSAO, etc...) but it seems it doesn't show up in Chrome (but it does in Firefox).
WebGL really is a nice piece of technology : it just works provided you run it in a WebGL enabled browser (any up to date browser except IE - some like Opera may require a pre-release version), no matter the platform
(OS, ATI/Nvidia, ...). So far I ran my small engine in several environments without any problem