Okay, my head hurts. I used to be on a PC where I had all my photos in folder based on dates. Then I got a mac, where my newer photos were in iPhoto, organized based on events. Now, all 4,000 of my photos are in a gigantic mess on an external hard drive. I only use my Mac now (running OSX), so for all you mac users, which app do you use to organize your photos? iPhoto? Aperture? Lightroom? Also, how do you have your photos organized? Based on dates? Events? Something else? I basically need someone to copy off of because I can't seem to make my own decisions on this. Thanks for your help!