AdViews - Thousands of television commercials created or collected by the DMB&B advertising agency, dated 1950s - 1980s
Internet Archive - Watch full-length feature films, classic shorts, world culture documentaries, World War II propaganda, movie trailers, and films. Many of these videos are available for free download.
Movieclips.com - A collection of searchable, free, licensed movie clips. Provides embed codes.
PhET interactive simulations - Free interactive math and science simulations for download or embed. Distributed under the Creative Commons licenses.
TeacherTube - Educationally focused, safe venue for teachers, schools and home learners. This YouTube for teachers is an amazing resource for finding educationally-focused videos to share with your classroom.
Ted Talks - TED is a nonprofit devoted to spreading ideas, usually in the form of short, powerful talks (18 minutes or less). TED talks are available under the Creative Commons Attribution-Non Commercial-Non Derivative license.
Vimeo - Similar to Youtube, Vimeo is a video-sharing website in which users can upload, share and view videos. It has a large collection of videos licensed under the Creative Commons licenses.
YouTube - Enter your search terms, then use the filters to search for Creative Common licensed video. Within the video select 'Show more' and find the Creative Commons License.