Career Exploration:

National Institutes of Health
Office of Science Education - Career explorer

Occupational Outlook Handbook 

Career Planning

Phd/Grad school programs

PhD's.org

Gradschools.com
Petersons guide to grad schools

Post-graduate Research Opportunities

Jackson Laboratory - Genetics Research Lab

National Human Genome Research Institute

Job resources in the Biological Sciences
(general lists / search engines):

American Institute of Biological Sciences

Biology Jobs

Science Careers

Medzilla

Science Masters

Science Jobs

Scientist Jobs

Careers in Biology

Jobs in Specific Biological Fields

Pharmaceutical Jobs  

National Science Foundation

National Institute of Health

Bioinformatics

Forensic Science

Careers in Marine Science

International Marine Animal Trainers Association  

Marine Careers 

National Wildlife Federation

Center for Disease Control and Prevention

National Science Teachers Association

Volunteer Opportunities

Peace Corps

AmeriCorps

AmeriCorps VISTA

For a list of links specifically related to careers in the Health Professions visit the Guide to Pre-Health Professions.