I first saw QuickTime VR in around 1999, and was so blown away by it that I ended up building a whole business around it. I made software that stitched the images, assembled them into a QTVR movie and let you build Streetview-type tours hosted on our servers. It was great fun, though reverse-engineering the Apple Graphics codec used for the the clickable hotspots was a bit tedious. Eventually we abandoned QTVR, as it became clear Apple had abandoned it. It was also a pain doing something that required the user to have the QuickTime plugin installed. We moved to using Flash instead, and it lives on at http://www.clevr.com/ . It's pretty much abandoned now, as the state of the art in stitching is miles ahead of what it was then. I will eventually move it to use an HTML5 viewer. Amazingly there are still thousands of MAUs, despite having had virtually no updates in years.