Looks like Microsoft has just enabled an ability to exactly alight you Photosynth with the location on maps. This feature allows you to change the scale and the orientation of you Photosynth so when you zoom in using Bing maps it is aligned correctly with that location… Looks very cool and I have not seen any word from Microsoft about this feature so I am not even sure if this is supposed to be public yet.
Photos and video showing how it work below:
Chose your Photosynth and click Edit Synth
Click the Geotag Tab
Under Allignment Click the Start button
Rotate the layover point map with the <> and + – controls
Align the point map to the features on the map