I use Google Maps a lot, especially Street View. Its awesome application, but I haven't seen any developer making application that connects all of those images into flow from point A to point B.
But, its already made and guess what it was built by google and its not an application but holodeck. Just like one in Start Wars, only it need some improvements in order to reach it.
It was presented during Google IO weekend and if we look at technology behind its already use in iMAX planetariums and Disney Circle Vision.