If you take a lot of digital photos, you know how challenging it can be to keep them organized. iPhoto, a free photo library application is included with Mac OSX. It does a great job helping you keep your library organized.
In iPhoto 9, Apple introduced a new featured called Faces which tries to identify and tag people in your pictures. With a little bit of training, it does this very well.
In this short video, Apple introduces Faces and shows you how you can start using it to track the people you love in your photos.