Recently I've been playing around with Panorama iPhone apps. Of the several that I have tried, I find Pano to be the best in class. Pano allows you to use up to 16 photos, is quick and easy. It let's you decide if you want use landscape or portrait modes. Start shooting your photos, and in successive order your shots lines up with the previous ones. Once you're done, Pano works it's Magic, to beautifully stitch your panorama together. The results are quite nice. Pano sells in the iTunes App store for $2.99