iPhoto '11: Source list
The Source list appears along the left side of the iPhoto window. It provides access to your photo library, including photos you import and the albums and projects you create from those photos.
If you’re in full-screen view, you don’t see the Source list, but you can access most of its items using the toolbar buttons along the bottom of the window. To exit full-screen view and see the Source list, click the Full Screen button.