Click to embiggen and get the full picture. Its pretty amazing, not the image but the tool to capture.
The iPhone panoramic feature is pretty awesome tool. You simply select it from the options bar, and rotate smoothly, keeping the arrow on the line and you get a seamless panoramic image. Just like this. None of that sloppy image blending from photoshop, this is really a wonderful tool. I use it often.
I've done a few others, but this is my favorite image so far. Love the desert sunsets. Loved better how the iPhone program seamlessly addressed the changing exposure from where the sun was setting to the already darkening horizon. Yummy.