I think I remember one of the Flight Simulator clones made by another publisher using stereophotogrammetry to generate terrain back in the 1990s, if I'm remembering correctly.
It'd be really cool if you could "export" a stereophotogrammetry generated "model" of a building, industry, etc. from Google Earth in a format that could be imported into a 3D modeling program like Blender, Gmax, 3ds Max, etc.