Kris, just out of curiosity, how do you handle the phone when you're taking panoramas?
I think that a lot of people beginning to shoot panoramas hold the camera out at arms' length and turn it around them, but this is actually an incorrect technique for panoramas. The closer that objects are to the camera's lens, the more important it is that the camera's lens stay at the same point in the air while you move around the phone.
That said, I see where you're heading with using fisheye lenses to get a clean single shot capture.
As a long time Photosynth user my feelings towards the panoramas, especially the mobile panoramas are mixed. I like that the mobile panorama app is so popular and I'm happy to see all the new contributions coming in, especially from Apple users, but panoramas aren't photosynths. Ultimately, Photosynth (the service)'s power is in connecting photography to each other, whether that be photo to photo, pano to pano, or photo to pano.