Brattoo Propaganda Software (http://brattoo.com/propaganda/) has released Duplicate Annihilator 4.13.0, an update of its Mac OS X software that finds and deletes iPhoto duplicates.
The software compares the images in your iPhoto library, using algorithms to make sure that no duplicates escape. It also now handles imported thumbnails, thumbnails of faces, corrupt jpegs and missing photos.
Duplicate Annihilator requires Mac OS X 10.4.x or higher and iPhoto 5 or later. It costs US$7.95 and is available worldwide from Brattoo Propaganda Software online. The 4.13.0 upgrade is free for existing customers.