This is an external link to the Wired Magazine.
The Virtual Reality Modelling Language (VRML) is a standard for VR on the Net. Wired has dedicated a server to VRML.
The Human Interface Technology Lab at the University of Washington in Seattle probably contains the most extensive collection of information about VR avaliable on the net.
The Interactive Visualizer at Georgia Tech is a full fledged VR environment being used in a wide variety of projects.
The Encyclopedia of Virtual Environments (EVE) at the University of Maryland at College Park is a collection of information about the many applications and components devices and technologies which comprise Virtual Environments.