Top Choices

Research Channel - thousands of full length educational programs from universities and research institutions

iTunes U - audio and video from colleges around the world Free, requires iTunes software

Annenberg/CPB - collection of educational videos and live Annenberg Channel. Free, but registration is required.

University Channel - videos of academic lectures and events from all over the world, from Princeton University

Forum Network - lectures by category from PBS and NPR

More

PBS Newshour: most show segments since 2000

PBS: Frontline - select investigative news stories on a variety of current events.

WGBH PBS Open Vault - short clips of interviews, famous events, and PBS programming

C-SPAN: BookTV, American Presidents, C-SPAN Classroom, All Recent Video, Search C-SPAN Video

CollegeAnywhere (WHYY) - over 70 of popular video-based college course previews

Big Think - questions answered by academics, politicians, writers, artists and presidential candidates

Prelinger Archives - advertising, educational, industrial, and amateur films from the Library of Congress

Archive.org Moving Images Collection - thousands of videos which range from classic full-length movies, to daily alternative news broadcasts, to user-uploaded videos of every genre

History Channel Video Clip/Speech Archive - famous historical video clips and speeches from the History Channel.

BIRTH Television Archive - archive of vintage video from the early times of European television

National Archive Online Videos - featuring historical films from NASA, United Newsreel, Depart of the Interior

VideoLectures - scientific videos (computer science, mathematics)

Google Educational Video

TeacherTube - an online community for sharing instructional videos

YouTube EDU - video posted by colleges

Science:

MIT OpenCourseWare - Lecture videos and demonstrations covering a wide variety of subjects.

NASA's Video Gallery - a selection of videos featuring NASA's current projects.

PBS: NOVA - a PBS program exploring a variety of topics on science and technology.

NASA: Destination Tomorrow - a series of 30-minute educational television programs that focus on NASA research, past, present, and future, and is designed for educators, parents, and adult learners.

Vega Science Programmes - provided by the Vega Science Trust, this English site provides links to a variety of programs on scientific topics.