Photosynth changes the game. Even though it is made by Microsoft, it is one of my all time favorite photography apps. (That alone should tell you how good it must be.) I find myself going to it over and over again. Photosynth allows you to take wide angle and panoramic photos with your iDevice, just by slowly moving around as it automatically shoots overlapping images which it then weaves together into a (mostly) seamless picture.
I've found the app to be pretty easy to use, consistently yielding pleasing results. My experience is that it works best when nothing in your shot is moving. Ask people to hold still as you pan near and over them or you will have ghosts and blurs, but sometimes that can be part of the fun. The app, and the non-required use of the web site are both free.