There are many excellent science video archives available online and they serve a number of functions from professional development for teachers through to research or background for students.

Video Tubes:


Teacher Tube - http://www.teachertube.com/

You Tube - http://www.youtube.com/
YouTube is a video-sharing service that allows users to post personally developed videos of nearly any variety online, from animations to personal recordings. YouTube is one of an emerging class of social applications that allows users to share and form communities around their content. It draws users into engaging content as commentators and creators, activities that heighten students' visual literacy.
The "7 Things You Should Know About..." series from the EDUCAUSE Learning Initiative (ELI) provides concise information on emerging learning practices and technologies. Each brief focuses on a single practice or technology and describes what it is, where it is going, and why it matters to teaching and learning. Use "7 Things You Should Know About..." briefs for a no-jargon, quick overview of a topic and share them with time-pressed colleagues.
(Source: http://www.educause.edu/ELI/7ThingsYouShouldKnowAboutYouTu/156821)

Google Video - http://video.google.com/
BIOLOGY TUBES AND REPOSITORIES

Lab Actio
n - A You Tube for Science Videos (mainly Biology at this stage) - http://www.labaction.com/

DNA Tube - http://www.dnatube.com/

Biologix Canada - http://www.learnalberta.ca/SearchResults.aspx?SearchPhrase=biologix&CurrentPage=1

Spangler Science - Experiments live on TV -

http://www.9news.com/news/education/spangler/default.aspx (some good movitating practicals)
http://www.stevespanglerscience.com/video/

Einstein in Hollywood:

Capturing the Scientific Minds of Movie Buffs - http://www.nicholls.edu/phsc/physics/movies/ (clips from action movies that could be used to springboard a scientific concep

PBS NOVA - ScienceNOW - Past Archives Search - http://www.pbs.org/wgbh/nova/sciencenow/archive/

Why is it so? Host by Prof. Julius Sumner Miller

(one of my boyhood heroes) - this show ran from 1963 to 1986 - and spawned countless children into the sciences. p://w

Four Corners Current Affairs TV Show -

Archive from the ABC in Australia - http://www.abc.net.au/4corners/archive.htm

How to Video Series http://www.wonderhowto.com/

Science Man Video Archives -

http://www.scienceman.com/pgs/video_archive.htm (an excellent set of resources in all scientific disciplines).

Bill Nye's - the Science Guy - Disney's Science Shows - these are excellent

Classic Bill Nye - the Science Guy - http://www.billnye.com/
Some Bill Nye Samples on the Tube:
Simple Machines - part one - http://www.youtube.com/watch?v=cMH7nWcbDN4
Simple Machines - part two - http://www.truveo.com/Bill-Nye-the-Science-Guy-10-Simple-Machines-p2/id/1570523174
Simple Machines - part three - http://www.truveo.com/Bill-Nye-the-Science-Guy-10-Simple-Machines-p3/id/1481640099

Insects - part one - http://www.truveo.com/Bill-Nye-the-Science-Guy-31-Insects-p1/id/2778976950
Insects - part two - http://www.truveo.com/Bill-Nye-the-Science-Guy-31-Insects-p2/id/201107719
Insects - part three - http://www.truveo.com/Bill-Nye-the-Science-Guy-31-Insects-p3/id/2990628901

Static Electricity - part one - http://www.truveo.com/Bill-Nye-the-Science-Guy-25-Static-Electricity/id/1009932340
Static Electricity - part two - http://www.tru
Talking Science - Talking Science is a bright new series of interviews by ABC Science journalists. The nine part series of half-hour interviews provides great scientists and science communicators with a relaxed forum to talk about their work and about their influences, inspirations and irritations. http://www.abc.net.au/science/broadband/talkingscience/ (videocasts or podcasts)

Catalyst Science TV Show - Archive from the ABC in Australia -

http://www.abc.net.au/catalyst/stories/default.htm
(These videos are streamed only but often also contain an interview or story transcript)

ABC iView Internet TV Service -

http://www.abc.net.au/iview/default2.htm
Is a relative new service that is provided free by the Australia Broadcasting Corporation.
iView requires ADSL2 speed connect but it does provide free content from ABC1 and ABC2 for a 14 day period from the original broadcast date - so if you miss it live - you can still see your program or recommend the viewing to your fellow teachers and students.
Others:

The Royal Society Archives - http://royalsociety.org/page.asp?id=3093


ARKive

- a record of thousands of videos, images and sounds of animals from around the planet. Amazing site.
http://www.arkive.org/

Periodic Table Videos:
http://www.periodicvideos.com/#