Hee hee! Lots more fun stuff!
Google Earth 4 is in beta. Amongst other things, it’ll be able to show much more sophisticated building models, with rendered surfaces.
So how will people create these models? Using Google Sketchup – a lovely simple 3D modelling tool which you could use for all sorts of other things too. It also links to a community-generated online library of models.
Sketchup has some good clear video tutorials here. Have a play!