In a recent post I described a WebGL pilot project for a client. After experimenting with a couple of WebGL frameworks I reverted to basic principles and wrote a purpose-built display app that was able to display 506K textured triangles at interactive rates. The demo let the user navigate through a pseudo-architectural scene using first-person-shooter style keyboard navigation.
I started following WebGL a few months ago when it was in beta in several browsers. Many creative web folks were already working with it, and some of the experiments were spectacular. Fast forward to the present, and Google Chrome now officially supports WebGL (although your computer may not be up to it), and Google has a WebGL Experiments website.