iMovie isn't only useful for people with video cameras . Still images with accompanying sound can be used to create high-impact presentations or documentaries, and can be used to spice up live-action films with professional title and credit backgrounds. Even if you're a digital photographer who is completely satisfied with iPhoto, you'll find that iMovie can create new and exciting ways to display your masterpieces.
If you've added view clips to your project from your camera or from other sources, they've almost certainly had sound accompanying them. What if you decide that you don't like the sound that goes along with your movie clip? Do you have to reshoot the video just for a new audio track? No, not at all. iMovie provides you the ability to use dozens of canned sound effects, record audio from your computer's microphone (if available), use music from your iTunes library, or even take the sound from other video clips and use them with different video sequences.