have you heard of TeacherTube? Most of the videos are aimed at teachers teaching at primary or secondary schools, so useful for teachers of English to young learners, however, some are aimed at teachers working with adults.
Here's one of my favourites
Check the site out!
Many thanks to Andreas Büsing of ELTA-Rhine and now of IATET (The International Association of Technical English Teachers) for sharing this link with me/us.