This is something I stumbled across, but it is quite useful.
If you want to extract all the images in an application bundle. Just drag the application bundle onto iPhoto. And let iPhoto do the rest. The bundles images will be in the Last Import tab.

If you want to extract all the images in an application bundle. Just drag the application bundle onto iPhoto. And let iPhoto do the rest. The bundles images will be in the Last Import tab.