Backstage Science - super set of videos produced by the UK Science and Technology Facilities Council
Science Update - Quirky, entertaining and informative, Science Update is a daily, 60-second feature covering the latest discoveries in science, technology and medicine.
Numberphile - Great site with cool videos and information about numbers (and stuff).
Web of stories - the site is a brilliant repository of "someone telling a story, speaking to the camera". It covers many areas and this link is to the stories related to science.
Short films from the 2010 Lindau meetings - The Lindau Nobel Laureate Meetings provide a globally recognised forum for the exchange of knowledge between Nobel Laureates and young researchers. Very interesting footage, accessible to scientists and non-scientists alike.
Public lectures hosted by The Kavli Institute for Theoretical Physics - online access to talks by experts in various scientific disciplines
Science and Development Network - News, views and information about science, technology and the developing world
Science for Citizens - ScienceForCitizens.net will bring together the millions of citizen scientists in the world...
Image and video library from the American Society for Cell Biology - absolutely fascinating images and videos illustrating a variety of biological phenomena
Science Daily - a site that does a pretty good job in presenting the breadth of breaking science news
World Science Festival
Genetic pot luck: the sushi factor - Links pertinent to the most recent cafe led by Paula Kavathas.
Science and Nature - Whether you're captivated by the magnificence of wildlife or by the wonders of science - the BBC has a wealth of delights for you to watch and listen to.
Science in action - The BBC brings you all the week's science news.
Making genetics easy to understand - a superb website from The University of Utah
The Human Spark - A three part PBS series broadcast in January 2010
350 years of science through the eyes of the Royal Society
Free audio-visual lectures by leading scientists, supported by funding from ASCB, HHMI and UCSF - excellent resource
Reith Lectures from BBC Radio 4 - Series of annual radio lectures on significant contemporary issues - science, society and everything between and beyond - delivered by leading figures from the relevant fields.
Link to some platypus footage from National Geographic TV.
Encyclopedia of Life - "an ambitious, even audacious project to organize and make available via the Internet virtually all information about life present on Earth."
Encyclopedia of Earth - "a new electronic reference about the Earth, its natural environments, and their interaction with society."
Fascinating short animations demonstrating some biological processes
Watch short interviews with some physics Nobel Laureates
TED Ideas worth spreading - Technology, Entertainment, Design - a superb site which could easily eat up the better part of your day!
British broadcasting legend Sir David Attenborough presents his views on Charles Darwin, natural selection, and how the Bible has put the natural world in peril in this exclusive interview for Nature Video