Stitching of all the images to make a 3D view takes only few seconds and is all done on the iPhone itself- which means you can even capture beautiful images in Airplane mode as well. The images taken by Photosynth are automatically saved into Photo album (Camera roll) in iPhone, and can also be shared via Facebook, Photosynth.net or you can also publish on to Bing Maps.
You can either choose to sign in to Photosynth app using your Windows Live ID or can also use it without signing in. I noticed that the app crashed many times after I used my Windows Live ID to sign in. But it work absolutely fine if I choose not to sign in! I assume that there is some issue with the part where the app is trying to link with Windows Live. Despite these few quirks, Photosynth is a very cool and fun app to create 3D panoramas. °
Photosynth currently supports iOS4 devices such as iPhone 3GS, iPhone4, iPod touch- 4th generation and iPad 2. Photosynth iPhone app can be downloaded free from AppStore or by clicking here.