It's on the agenda! I still need to figure out how to render a mesh from the same shared texture/geometry buffer, but then there will surely come some next level demos. I only say terrain and erosion...
Btw, a post regarding my latest WebGL (particle) experiments is here to find:
As for cellular automatons, check out Ready: http://code.google.com/p/reaction-diffusion/
I haven't tried it myself yet (too busy) but Tim Hutton
showed some sweet screenshot of it for all kind of cellular automatons in 2D and 3D.
You might also like http://softology.com.au/voc.htm