At the moment I manage my photos on my external HDD (firewire 800) by placing photos in folders to organise them. Im contemplating Aperture 3, since it is now much cheap in the AppStore. I want to install Aperture 3 on my internal HDD, and nothing else - so keep all my photos external etc. Im assuming I can do this? Will it reorganise all of my external photos into its own library?? If so how do I 'remove' photos from it so I can upload them to a site to be printed and posted to me? Also, I understand that when you make changes to photos, it doesnt actually change the photo image itself? So how does this work?? What if I make changes and want the original photo overwritten with those changes??