There apps that include widgets that can be put on your lockscreen. There are not many available yet, since this is a new feature of Android 4.2, and only a few devices have the latest version.
Sherlock was spot on. On your lockscreen, drag the clock to the right, then press the plus sign in the empty box. This will bring up the widgets available to use. More than one can be added, and you can scroll through them on the lockscreen. When scrolling through them, tap one and you will be prompted to unlock. You cannot change the location of the widgets, only the order in which they appear.
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