With the Mac OS X v10.6 there are several different way for photos from an Aperture library to be attached to Apple Mail. You can either click on the mail button in the toolbar or open a context menu with a right click onto the selected photo. Subsequently, activate option “Output” and then command “Email”. Basically, there is no need to start Aperture if you are in the “Email” mode. Just open a new email and click on button “Photo Browser” in the toolbar. Apart from the iPhoto database you also have access to your Aperture photo database.