WebGL Report is an open source project that checks whether or not a browser supports WebGL, and if so, reports details such as supported extensions and implementation specific capabilities.
Travis Glines released a proof of concept chat app using WebGL, Node.js, Websockets and a few other technologies. Its a fun and interesting way to demonstrate a chat room in real time. "When you think of 3D on the web, you typically think of games first. Games in 3D are fun, but what if you could do multiplayer gaming inside a web browser, with a server that could scale?" wrote Travis. This demo reminds me a bit if BZFlag in its early days, and is worth a few minutes of your time to check out.
The Signals Blog has started a tutorial series on WebGL for Chemistry. To-date, only the first two tutorials in the series are complete, however it is looking to be a very promising tutorial.
John Bohannon and George Michael Brower have put together a stunning display of data using WebGL.
Mozilla has launched a showcase website called Web O'(pen) Wonder. There are some well done WebGL examples as well as other HTML5 demonstration pages. Some of the pages require Firefox 4 specifically, where as most of the examples simply require a WebGL enabled browser.
BioDigital Systems have create the BioDigital Human with WebGL. Using data collected during the Digital Human Project, they have created a 3D model of the entire human body.
Fractal Lab is a WebGL based fractal explorer allowing you to explore 2D and 2D fractals. The fractals are rendered using the OpenGL Shading Language (GLSL) to enable real-time interactivity. Be warned: you may not get much work done if you start playing with this.
Khronos has posted slide presentations from GDC 2011 online. Included in the DevU presentations are COLLADA, Mobile, OpenCL, OpenVG and WebGL.
After a short delay, the complete Final WebGL 1.0 Specification is now online.