I commented on Photosynth - the very cool little app swallowed by Microsoft - a while back. Viewfinder is similar except it tacks on to Google Earth, adding an elegant new dimension.
I think if it takes on the multi-shot nature of Photosynth (as opposed to single shot shown in the vid above), it will be better.
The software clearly has a slew of uses but I think simply being beautiful is one. Software becomes art.