The output of a croped image is not really croped, if the option "Crop Image Size" is enabled.
Attached is a blend file with an easy node setup, it uses a Translate node after the crop and you will see, that parts of the image are visible after the translate node which should be croped.
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The crop node has limited use still, we don't have "canvas awareness" in Blender yet. Compositer design is currently fully meant to work as part of a render pipeline, where the image resolution is fixed.
Jeroen: a translate node before or after crop node gives same result. Is that meant to?
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Well the image setting of the crop node just centers the image and resizes the view of the image, but when mixed with other nodes not visible pixels can be displayed.
When not using the image setting the color is blacked. Perhaps we should also do that with the image setting. This way the crop node will work better.