Photo Importer is a small and user-friendly menu bar based Mac application which will automatically import photos from a selected folder. You can use Dropbox to transfer photos between computers and devices (requires iPhoto'11).
Photo Importer does not use Dropbox as storage. Photo Importer deletes the photos from the Dropbox share when they are imported into iPhoto.
Version 1.3 has been enhanced for retina displays and has a new preference layout.