Here’s a great resource if you are a UK-based teacher looking for quality video resources for your lesson.
Learning Zone Broadband Class Clips provides rich audio-visual material for use in primary schools, secondary schools and colleges. These short videos have been selected to match the curriculum. They can be used in many ways; from the stimulation and engagement of students to the delivery of very specific learning points. The material is drawn from the Learning Zone and elsewhere in the BBC.
As far as I know, you can’t access this outside the UK, but if you can get it then it’s a fantastic site to bookmark.