Kristina,
They are so helpful. And, I have had my students use Jing to make their own to support the class as well and I give them participation points for doing that. I ask students to make a video no more than 5 minutes that teaches someone how to do something that deals with the course content. Then, you can keep them for the next time you teach and begin to develop a "library" of support videos for the next students in the class.
