I began with Picasa. Then, I began this adventure in "mac-land", I started using iPhoto. Now, I have "Aperture". Here's the question... As I have changed programs, and "imported" from the previous program, have I actually duplicated all my photos 3 times? Or do I have 1 set of photos, that all programs "point" back to? If I now have 3 sets of images, how do I go about deleting the previous 2? Thanks for the help.