One of the cool new features of iOS 5 is that it allows you to bring up the Camera app directly from the lock screen. No need to unlock the phone, look for the Camera app and launch it, as you can now do that right from the lock screen now. This simple feature can save time if you want to take a picture right away.
I've been asked a few times today how to activate this feature, and even though most of you out there probably know how to use it, I figured it might be helpful for new iOS users...