If your iPhoto library contains video clips shot with a digital camera, you can use those clips in instant slide shows and slide show projects. iPhoto even lowers the volume of your background music when a movie clip plays so you can hear the movie’s audio.
In slide show projects, you can use the Slideshow Settings pane to apply effects to video clips. You can even create Ken Burns moves to pan and zoom across video. It’s also fun to use video clips in the Sliding Panels theme, where multiple clips play at once.