I don't think enough people are understanding (1) how cool this is (switch to the tunnel presets and start tweaking the inputs and the shader!) and (2) how important this is for introducing/teaching people about computer science. Now, for the first time ever, we can actually teach kids how to program cool 3D graphics with just a browser (no downloads, no messing with installation issues, no platform-dependent crap).
I'm planning on teaching a class on WebGL for high schoolers at my university (for those of you who are curious, it's through this program [1]). All I have to do is get them to open Chrome/Safari, show them this page and teach them a few basic concepts about OpenGL/vertices/textures/shaders and they can start learning stuff on their own. Hacking and tweaking stuff is the most fun way to learn something. And I think this could be a major milestone for computer science education.