Smart folders are intelligent ways to pull together virtual collections of your images. The great thing is that smart folders are living creatures that continue to populate automatically as the images you add to your library meet the conditions you've set up.
Here's a short video on how to set up smart folders in your iPhoto library.
More Training Available
There are now two ways to learn and have more fun with iPhoto '11: my iPhoto '11 Essential Training ONLINE at Lynda.com, and the new iPhoto '11 Essential Training DVD that you can purchase from the Lynda.com Store for $49.95 US.