Biology
Indexes and Databases

• Agricola--the Dept. of Agriculture's free online search utility for journal articles on agriculture, forestry, wildlife, etc.
• Biology Careers
• Biology Dictionary
• Biology Journals on the Net--links to them  
• Biosis: Resources for Biologists--especially taxonomy, zoology.
• Botany Internet Index--An extensive directory of over 3,700 briefly annotated botany-related Internet resources coordinated by individuals in the US, Canada, and Finland. Site categories include arboreta, botanical societies, taxonomic databases, images, ethnobotany, paleobotany, and more. A What's New section is updated every two or three weeks
• Cell and Molecular Biology Online -- 
• Darwin Digital Library of Evolution -- "makes the full literature of evolution available online within a historically and topically coherent structure. The work of Charles Robert Darwin is our pivot, but our framework includes the 17th century to the present and encompasses the history of evolution as a scientific theory with deep roots and broad cultural consequences."
• International Plant Name Index--formerly the Gray Card Index Database  currently includes over 325,000 citations of names of New World vascular plants at the rank of family, genus, species, and their infra ranks (e.g. subfamily, tribe, subgenus, section, series, subspecies, variety, form, etc.) Searchable.
• Microbiology Network
• The mtDNA Population Database: An Integrated Software and Database Resource for Forensic Comparison
• SciCentral's Biology Gateway--a beautifully organized site, with "gateways" to sub-disciplines, to databases, research reports, educational materials, conferences, employment, funding, and more.
• Searchable Index for the WWW Virtual Library of Bioscience
• Virtual Library of Botany/Plant Biology -- from the University of Okalhoma