Connotea
Free online reference management service for scientists to store or share articles and links.
http://www.connotea.org

Web Directory: Embry-Riddle Aeronautical University Virtual Library
Offers a virtual library of aerospace and aviation topics. From Embry-Riddle Aeronautical University.
http://www.embryriddle.edu/libraries/virtual

National Aeronautic Association
Seeks to advance the art, sport, and sciene of aviation and space flight. Also oversees and certifies United States aviation records.
http://www.naa-usa.org

Anthropology Tutorials
Addressing the core issues of physical and cultural anthropology. Created by Dennis O'Neil, PhD, of Palomar College.
http://www.anthro.palomar.edu/tutorials

WhoZoo
Pictures and information about animals that can be seen at the Fort Worth Zoo.
http://www.whozoo.org

MIT Press: Artificial Life
Official journal of the International Society of Artificial Life. Contains articles, an archive, and a look at what's coming ahead in Artificial Life.
http://www.mitpress.mit.edu/catalog/item/default.asp?ttype=4&tid=41

Neave Lab: Planetarium
Virtual clickable Flash planetarium.
http://www.neave.com/lab/space/planetarium.html

RatLab: Where All the Mad Scientists Go
Contains fun science articles and facts, "do try this at home" science experiments, and profiles of young scientists.
http://www.ratlab.co.uk

Visions of Science Photographic Awards
Competition sponsored by The Daily Telegraph and Novartis. Includes galleries of past winners.
http://www.visions-of-science.co.uk

Science of Baseball
See what makes a home run, learn how a curve ball curves, and check your fastball reaction time.
http://www.exploratorium.edu/baseball