I’ve just finished my port of Chocolux for WebGL (click for demo page).
Chocolux is a real-time recursive GPU raytracer using four spheres by Auld. Today, Chocolux now can run in your web browser.
The implications of this are pretty mind blowing. WebGL now allows compiled code to run on the GPU. Imagine what games, image processing, and applications will be possible with compiled shaders and general GPU computing (OpenCL?) now in the browser. And with WebGL gaining widespread adoption, it’s going to be here fairly soon.*
For more information about cutting edge fragment shader GPU raytracing and rendering, check out Rendering Worlds with Two Triangles (PDF).
*pending completion of a stable WebGL spec, naturally.