Earth's Largest Free Full-Text Science Archives
Annotated list of sites that provide access to scientific materials. Includes the NASA Astrophysics Data System (ADS), with free access to full-text articles in astronomy and astrophysics; Stanford's HighWire Press journals in biomedicine and other disciplines; and more than a dozen other major resources. Site is updated quarterly.
Google Web Directory: Science
This Google service allows the user to choice of searching only within pre-selected science sites which are categorized by topics that range from agriculture to biology to chemistry, the environment, physics and many more.
SciCentral - Gateway to the Best Scientific Research News Sources
Since 1997, the SciCentral editors have been aggregating breaking research news from the most reputable and reliable sources. The service has received over 30 Web awards and enthusiastic reviews from leading science publishers (e.g.; Science Magazine, The Lancet, The New Scientist) for the quality of its service. Over 700 other websites point to SciCentral as a trusted source of information.
Science.gov
Science.gov is a gateway to over 50 million pages of authoritative selected science information provided by U.S. government agencies, including research and development results.
Scirus - for scientific information only
"Scirus is the most comprehensive science-specific search engine on the Internet. Driven by the latest search engine technology, Scirus searches over 415 million science-specific Web pages, enabling searches to pinpoint scientific, scholarly, technical and medical data on the Web.
The WWW Virtual Library of Natural Science and Mathematics
This site is a part of "the oldest catalog on the Web" yet is updated frequently.
Yahoo Science Directory
This directory allows searching within a set of reviewed web sites from a wide range of the sciences.