Did you ever wish you could use your iPhone camera to take images at rapid-fire speeds and save the best ones? SnappyCam Pro does just that. The app is US$0.99 for a limited time.
The app's developers claim it will shoot up to 20 full-resolution pictures in one second when run on an iPhone 5. That's very fast. Rather than take time to save to your camera roll, the app presents a display of your images, and you can select the ones you want to save. GPS data is included, and all the other metadata the iPhone provides is tagged to each photo.
This is a great way to get decent sports, pet or kids photos. The app is working within the Apple SDK, so it doesn't break anything, but it fine-tunes and speeds up the taking of images to a degree that just hasn't been seen before.