I can think of few things that engage children as much as movies, especially if the movies feature the children themselves. Because of this, I love to use video in my classroom to give evidence of the learning that has taken place and to illustrate the students’ reflection. Sometimes the video captures only a lesson, and sometimes it demonstrates an entire unit of learning, but always the students want to watch again and again. Parents are also delighted to get a glimpse into the classroom and to watch their child talking about learning.
To this engagement, add the mounting evidence of the importance of visual learning (some is referenced in the slides below), and you would be hard pressed to find a good reason to NOT use video.
The wiki for my Point and Shoot presentation from BLC has lots of examples of students and classrooms that are using video in their classrooms (thanks, PLN!), as well as links to more information. The slides are embedded below.