I'm brand new to mac's, so I apologize if this is a dumb question. When I set up my new macbook I transfered about 16 gigs worth of pictures, and then imported them into iPhoto '08. I've noticed now that in my pictures folder, along with all my photos, is a icon iPhoto Library that is about 16 gigs in size. Can someone help me understand what the icon is? I'm assuming it contains all my pictures I imported into iPhoto. If this is the case, does that mean I'm storing two copies of all my photos now? I'm asking because I don't really have an extra 16 gigs to spare.