WebPlatform Docs - share your knowledge and learn

Apple, Google, Microsoft, Facebook, Nokia, Adobe, HP, Opera Software and the Mozilla Foundation (usually rivals) have come together with the World Wide Web Consortium (W3C), and Tim Berners-Lee to collaborate on the development of HTML5 and create WebPlatform Docs.  The purpose, as described in its blog is: "For years, web developers have had to rely on multiple sites to help them learn web programming or design, each with one piece of the puzzle. Great sites appear, covering one or two subjects, but too often fail to keep up with the rapid pace of changes to the web platform. This may have been good enough when the web was just simple HTML, basic CSS, and maybe a little JavaScript, but that was a long time ago. Today's web is more than just documents, it's applications and multimedia, and it's changing at a breakneck pace."
    If you're a web developer you can create an account and share your experience and learn from others. It will be interesting to see how this compares in the future to StackExchange which already has several programming & web development Q&A forums.