Smart playlists, photo albums and mailboxes find music, photos or messages for you.
iPhoto 4 brings in keywords, making it easy to group photos.
iPhoto makes it easy to email a photo in a couple of clicks.
How to group photos into albums manually in iPhoto.
iPhoto makes it easy to store and organise photos and other images on your Mac.
A couple of ways to set Dekstop Pictures in Mac OS X.