This a great piece of code but the author does one thing that has gets my goat.

A lot of these cutting edge HTML5/WebGL demos are put on a separate page from the thing explaining it. One of the reasons we have this technology is so we can put this stuff right there on the the page, seamlessly available to the user.

Sometimes it makes sense for performance or aesthetic reasons to have it separate, but certainly in many cases including this one it doesn't.

Keep a separate demo page sure, so people can link directly to your demo. But have it right there in your blog post as well, personally I think it adds to the wow factor!