I’ve been working on LookingGlass which is a stand-alone, you-have-to-download-it viewer for the OpenSimulator virtual worlds. I really wish one didn’t have to download the viewer. Viewing should just happen as part of the web.
I’ve looked at this several times and it looks like the infrastructure is maturing. WebGL is appearing or will soon appear in most browsers. This provides the basis for getting accelerated, 3D graphics on the screen. Additionally, it is standard in the browsers (IE is a problem, Microsoft being who they are, but Google has a plugin to fix that).
The new O3D is early in its development but it is coming. 3D on the web is just around the corner.