Having two 17" PowerBooks around the house has led to a problem. We've accidentally imported our photos onto both machines, and now we don't have a true master that contains all our pictures. To rectify the problem, I tried using rsync to update my ~/Pictures/iPhoto Library directory with the one from the 2nd machine. All the pictures were migrated successfully, but not the photo albums, nor the thumbnails in iPhoto. I even tried importing the new pictures, but it says the file is not a valid image (even though I can open it in Preview just fine). Any ideas for a better synchronization strategy?