Animoto provides a free Web 2.0 video service for educators.
Videos can be made from images and music can be added as a sound track.
Student videos can be as short as 30 seconds or longer.
Students can make videos of their class projects and embed them in a class Wiki, blog, or in a multimedia presentation.
The flexibility and ease of this service adds a new dimension for teachers and their students.
This is a video I made in about 20 minutes using Animoto: