Thank goodness for TeacherTube, especially for schools without access to Discovery Learning or other for-fee educational video sites.
A well-selected video can quickly demonstrate a concept that would take much time to explain. Additionally, many of our students are visual learners, so being able to "show" as well as "tell" is a plus for most classes.
And having student work uploaded gives our kiddos an opportunity to be the teachers for their peers. (Gotta watch that performances of copyrighted works aren't uploaded to TeacherTube without permission, since it's an open-access site.)