What's New in Version 9.3
iPhoto can now open libraries from Aperture 3.3 or later
AVCHD video is now supported
The Description field now automatically expands as needed when entering text
You can now flag a photo in Magnify (1-up) view by clicking a Flag icon displayed in the upper left corner of the photo
Keywords and titles are now preserved when exporting files with embedded GPS location data
A new Export option allows you to automatically organize exported photos into subfolders by event
The update is recommended for all users of iPhoto '11.