Photosynth's website has never officially supported saving your photos, panoramas, etc. back to your computer, but community members who are programmers themselves, such as Henri Astre, have created a way to download the individual photos in photosynths. http://bit.ly/photosynth-toolkit
Perhaps, he will also create a way for us to download our own panoramas and save them in HDView's format or possibly even convert it to QuickTime VR's format.
(Note that photosynths and panoramas are two different things and that the iPhone app can only create and open panoramas at the time of this writing.)
Although I am only your fellow user, I think that your request is a good one. I wish I could link you to a simple solution but, as far as I know, one does not exist yet.