To help you properly frame your shots, there's a new Grid option that divides the screen into thirds. The addition of an optional grid overlay might be useful for photographers practicing the rule of thirds. To toggle the Grid view on and off, tap the Options button in the Camera app. (The Options button replaces the old HDR button--but the option to toggle HDR images now lives right next to the Grid option in this new menu.)

You've always been able to tap once on screen to set the focus and exposure point for an image. But if you move the phone, or if the view changes too much, the Camera app will recalibrate and pick a new focus and exposure point. If you'd like to force a certain focus and exposure setting and lock it in place no matter where you point the camera, just tap and hold until the blue box appears and pulsates. The words AE/AF Lock appear at the bottom of your screen.

Another new feature of the Camera app is the ability to use a Multi-Touch gesture to zoom in and out. If you want to zoom in, just stick two fingers on screen and spread them apart. The Camera app will do exactly what you expect it to do: Zoom in. Just pinch with two fingers to zoom back out.

But perhaps the coolest new feature of the Camera app is its integration with the Camera Roll. Yes, you can still tap on a small thumbnail image to view the photo you just took. But there's now a more intuitive way to view previously taken pictures: just swipe with one finger from left to right. It's as if the camera interface is the most recent photo on the Camera Roll, with all your photos right behind it. It's a good move: Swiping back to check your recent shots feels a lot more natural than tapping the thumbnail and navigating through the Camera Roll interface.