Very nice tour, but it seems that panorama doesn't have multiscale levels. Such the prelouding effect you can achieve also with Tourweaver (choose it at publishing settings);
Google maps provide pseudo-3D google maps and its API. So, it is possible to such map without big effort. I use it sometimes, take a look here (second example): http://www.virtualivizija.lt/en/google-maps
Guess Easypano guys also can make similar map easily (within a month) if they want to.
There's possibility to do even more, like adding 3D models (like in the 3-rd example), but not for the production sites yet.
My Tourweaver components: http://www.optitecha.lt/categories/3