Floh's website is at http://www.flohofwoe.com/ and he's got links to demos of using Emscripten there as well as some other interesting stuff.
But the most amazing thing is that they basically just compile their existing engine that has years of development to the browser using emscripten and it works. Thats a bit of a death blow to the new (and still very limited) JS 3D Engines, but of course their ease of use is a big benefit and they still make sense for smaller/web integrated projects.