American Association for the Advancement of Science (AAAS) Provides information on doctorates and program activities, meetings, membership, publications, telephone directories and other services, etc.

Materials Sciences Jobs Page Contains links to web sites for jobs in research/science/engineering.

Nature International Science Jobs Presents an international listing of science jobs. Jobs are indexed by subject, country, organization and position (updated weekly).
 
Crystallography World Wide Lists national and international vacancies in crystallography.

Job Opportunities in Entomology Includes job listings in entomology and links to other sites.

Journal of Metallurgy (JOM) Classifieds Includes educational and professional job listings from the past three issues of the Journal of Metallurgy.

Los Alamos National Laboratory Consists of job listings at Los Alamos National Laboratory.

Materials Sciences Jobs Page Contains links to web sites for jobs in research/science/engineering.

Medzilla Provides employment resources for biotechnology, pharmaceuticals, medicine and other science professionals.

The National Academics Center Includes job opportunities, internships, fellowships and professional society listings for beginning scientists and engineers.

Nature International Science Jobs Presents an international listing of science jobs. Jobs are indexed by subject, country, organization and position (updated weekly).

Science, Classifed Ads Includes many job listings from the periodical Science.

Science Professional Network Includes scientific employment opportunities, information on career workshops, science career fairs, etc.)

Astronomy

Job Register American Astronomical Society Includes job listings in astronomy.

 Biology

BioMedNet You must become a member (free service) and then you can obtain journal abstracts, 3 months free access to Current Biology, job exchange, discussion groups, etc.

Cell Press Online Cell Press is an online journal that provides links to resources and employment opportunities

Employment Links for the Biomedical Sicentist Lists biotech job postings.

Job Listings and Career Services Includes job listings, company contracts, associations and societies, libraries, publications and university contracts.

Chemistry

The American Chemical Society Provides links to extensive information on chemistry.

Virtual Library Chemistry Presents links to chemistry sites at: academic institutions, non-profit institutions, commercial organizations, chemistry gopher services, Usenet groups, etc.

Oceanography/Marine Science

Aquatic Science Jobs Presents limnology and oceanography positions (newest announcements are listed first).

Hatfield Marine Science Center The Hatfield Marine Center is located in Newport, Oregon and is part of Oregon State University. Includes information on programs and provides links to other resources.

Monterey Bay Aquarium Contains information on aquariums and many links to related information.

Woods Hole Oceanographic Institution Provides job listings and educational programs at Woods Hole.

Physics

AIP Jobs - The American Institute of Physics Employment Opportunities Database Includes employment opportunities in physics and links to resources.

Jobs in Physics Offers job opportunities in physics worldwide 

Physics Jobs Online Includes job opportunities in physics arranged alphabetically by field, including postdoctoral and student jobs.
login and password: careers

Physics Job Announcements by Thread Consists of job listings provided by Los Alamos National Laboratory. Offers an extensive listing of positions in physics (mostly university and research lab jobs).

Physics World Jobs Current Vacancies Lists current vacancies in physics and provides links to extensive resources.

Usenet (Newsgroups)
High Energy and Nuclear Physics Network