In addition, you can update your contacts' information with their Twitter usernames and even add pictures for them based on their avatars.

Picture-taking gets a bump in iOS 5, with a handful of much-requested smaller features. For example, you can now access the iPhone's camera from the lock screen by double-clicking the Home button and tapping the new camera button, which appears next to the lock slider. And once you've launched the camera, you can snap a picture by pushing the iPhone's Volume Up button, which should please those who like tactile feedback as well as frequent self-portrait takers.

There's also the ability to lock autofocus and exposure by tapping and holding on the part of the image you want, as well as a slider to display grid lines, which help frame your shot correctly. If you want to zoom in on part of the image, it's as easy as using the phone's tried-and-true pinch-and-zoom.

Once you've snapped a picture, you can use the Photos app's new editing tools--such as red-eye removal, auto-enhancement, crop, and rotation--to tweak it to your liking.