http://www.nist.gov/index.html National Institute of Standards and Technology. You name it - health, materials, energy, nanotechnology, chemistry, physics, math etc. information.
http://electronics.howstuffworks.com/gadgets/other-gadgets/techstuff-podcast.htm How Stuff Works by Discovery.com
http://www.discoverychannel.ca/showpage.aspx?sid=12604 Mythbusters home site – busting and confirming myths thru science.
http://www.eoearth.org/ "Encyclopedia of Earth, an electronic reference about the Earth, its natural environments, and their interaction with society."
http://scienceworld.wolfram.com/biography/ Biographies of scientists
http://www.loc.gov/rr/scitech/selected-internet/africanamericans.html African Americans in Science and Technology - from the Library of Congress