Swapping Crop Fields
Adobe snuck a little button into the Options Bar that’s hardly noticeable. It works with tools such as the Crop tool (C), and it’s a big time saver. For example, for the Crop tool it swaps the measurements in the Width and Height fields, so if you have the Crop tool set to crop to exactly a 5×7", if you click this button, it will now crop to 7×5". See? I told you it was handy.