How I Use It
I have used this app to create a number of short video lessons on a variety of topics for my classes. It is easy to use, and has great features. You can upload images, and create multiple pages ahead of time or as you record. Once you have finished recording, you can save the recording in the app, or export it as a movie file to connected cloud services such as dropbox. This allows you to work with the file without having to go through a specific website to view the videos.
I think doodle cast is a great tool for creating video lessons that can be exported and then shared with students in a variety of ways. It could also be effective to have students create a video explaining a concept or working out a problem, and then submit the file through an LMS or Cloud system for the teacher to view.