Animoto is a free, web-based (also available on the iPad) video creation tool. The application provides generic themes, pictures, music, and video clips. Simply select or upload your own pictures to use in your video then add a soundtrack to them. If you want to add text, you can do that too. This is a terrific way to create a short, beautiful presentation. Educational uses vary from teacher-made instructional videos to student videos to demonstrate understanding or tell a story.
This is an example of an Animoto video made by simply uploading student pictures, choosing an Animoto theme and music.