Oops! What button did I push?

Using Blender 2.63, my camera view shows a reddish-orange dotted line on the outline of my camera and zooming now moves the camera instead of giving me a larger view of the camera view.

How do I undo whatever I did?

You have checked Lock Camera to View. This can be turned off by pressing N to bring up the properties tool shelf and deselecting the Lock Camera to View box under the View tab.