Your iLife Flashing Before Your Eyes
When you move your mouse pointer across an event, its thumbnails flash by. Besides being a fun way to impress your Windows-using friends, this is a great way to quickly see which shots are in a given event.
Each event has a "key" photo, also called a <em>poster</em> photo—this is the shot that appears in the event’s thumbnail when you <em>aren’t</em> skimming across it. Sometimes, you might want to change that key photo to one that more accurately represents the entire event. It’s easy: just skim across the event thumbnail until you see the photo, then tap the spacebar.