I have 3775 pictures in my iPhoto library and thanks to my Duplicate Annihilator its no longer 4958! I recently transferred from one computer to another and due to that process I ended up have duplicates of more than a 1,000 pictures. Unfortunately iPhoto does not immediately find duplicates on its own but Duplicate Annihilator is a very reasonably prices program. $7.95 with tax it was $8.47 eight and a half bucks is totally worth HOURS of my time combing my iPhoto library trying to purge doubled photos.
