Thanks to a tweet from Rich White, I see Google is jump-starting the idea of hardware accelerated 3D graphics in the web browser. Check this video out.
What is O3D? From their website:
O3D is an open-source web API for creating rich, interactive 3D applications in the browser. This API is shared at an early stage as part of a conversation with the broader developer community about establishing an open web standard for 3D graphics.
All you have to do is install the plug-in, restart your browser, and visit the samples page. There are a bunch of proof on concepts there that give a general idea of what is possible. I can’t wait to see what people start creating with this.

