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iMessage is Apple's equivalent to the BlackBerry Messenger service. So many people flock to the BlackBerry to have encrypted instant messaging conversations with their friends; well, Apple now has its own encrypted, secure messaging solution. In a very similar fashion to "BBM", you can send messages, photos, and other content -- and see when messages have been delivered and read.
Though only a small thing, and hardly a 'major feature', Apple has now put a camera button on the lock screen. To access it, you can simply double-press the Home button to enable the button. You can then take a photo even faster without having to enter a password. Your photos are still safe though, as it locks out your other pictures until you enter in the Home screen password.
For those who take the rule of thirds seriously, or even amateur photographers who want to use the new 8-megapixel camera in the iPhone 4S, you can display a grid on screen to ensure photos are captured to align shots up perfectly. Granted, I know nothing beyond "point and click", but this will be a useful feature for photographers, I am told.