By georeferencing, I'm refering to the general act of placing data at specific locations in space, not just the act of associating data with geographic locations. Examples of the former are the many attempts at using representational spaces to organize data, such as file folders in Windows or the desk and hallway approach of Magic Cap. A good example of the latter is being carried on at UCSB's Digital Alexandria project. The problem with representational spaces until now has been that real architectural spaces usually make for dreadful ways to access data. Bush-Nelson links implemented in VRML overcome this by allowing meaningful navigation among the links regardless of their positions in space.
Data can be georeferenced, but still navigable by association.
3DXML is a tool for allowing actual information architecture to occur, if that term is taken to literally mean the placing of information in space. Spatial self-organization refers to the rather recent occurence of structures like web rings. Another interesting aspect to 3DXML is the fate of the ad banner. The image above is of a VRML world created by the design firm Out Of The Blue. Its an example of what they call an Advironment.