This technology has potential not only in planning vacations but also in cultural documentation and preservation. Historical buildings that are no longer standing can be modeled and uploaded to the internet; not on Google Earth itself (one of their requirements being that the structure is still standing), but on institutional and personal websites. This allows us to see what we've lost.
Using Google SketchUp, I took this photograph of the Charlestown Navy Yard,
|Image courtesy of the Boston Public Library|
and was able to create this model,
which is the 2D image of this 3 dimensional structure,
which can be viewed by clicking on the image and visiting the Google 3D Warehouse.