It's also possible to use other types of multimedia, mostly through browser plug-ins, for various purposes. For example, VRML (Virtual Reality Modelling Language) and X3D both allow you to create three-dimensional “worlds” which can be navigated through the browser, allowing architectural models to be viewed or even 3D hypertext documents to be created and browsed. Virtual-world games such as Second Life also use these formats to allow players to construct their own objects in the game world.

It's worth taking a look at the browser plug-in download area on the Netscape, Mozilla and Internet Explorer websites; you'll find many ideas for all kinds of multimedia.