points to this very intersting article on the 3D Web browsers
in Scientific American. He writes that of the 3D systems mentioned, "A Swiss company, Geonova (www.geonova.ch), seems to demonstrate best that the idea of a geography-based Web is feasible with today's PCs. Engineers there created two impressively detailed models of Switzerland--one of the entire nation with 25-meter resolution and another of two central cantons at 50-centimeter resolution. .. Text and iconic labels hovered quite legibly above towns, lakes, companies and tourist attractions; clicking on the labels opened associated Web pages. What other 3D browsers are there -- VRML plugins have been around a while -- yet they do not seem to be successful. Why is that?"