I have about 20,000 pictures in a 60gb file on my mac's desktop. I am going to use iphoto 09 for the first time DoI copy all of the pictures in the "pictures" folder? Do I just drag and drop them onto iphoto? I want only one copy on the computer, I dont want to double the size of the used space by another 60gb, so how do i import pictures into iphoto and then delete the existing folder? Is that what I do?