When something like Photosynth is released you begin to wonder what are the practical use cases.  I found this "synth" on the site today that really shows the power of Photosynth.  It essentially is photo tour of the Art Gallery of South Wales.  Not only do you get a 360 view of the room, you also are able to zoom in closely and see the artwork on the walls.  There are several similar situations where this could be used.  Real Agents would love something like this.  I think the real power in something like Photosynth would be potential for social scenarios.  I know there has been talk before where individuals would be able to combine their pictures into a single "synth".  This means multiple patrons from the museum could combine their pictures and create the ultimate tour.