This is technical, so probably not for everybody.
I was looking around for whatever happened to the rush towards 3D virtual reality on the web 5 years ago. At that time it looked like all sorts of things would end up in VRML pretty quickly. Virtual Reality Modeling Language was a standard for representing and exchanging 3D objects or worlds, which you could access with a plugin in your browser.
The action seems to now be in X3D - Extensible 3D Graphics, which is a standard being developed by the Web3D Consortium, which is superseeding VRML. more >