From the Epidemiology Monitor Job Bank:
http://www.epimonitor.net/JobBank.htm

From the Association of School of Public Health (ASPHA):
http://publichealthjobs.org/

From Emory University, The Public Health Employment Connection:
http://cfusion.sph.emory.edu/PHEC/phec.cfm

From the American Public Health Association
http://www.apha.org/about/careers/

From the Association for Professionals in Infection Control and Epidemiology:
http://www.apic.org/Resources/Career-Center

USAJOBS, sponsored by the U.S. Federal Government:
http://www.usajobs.gov/

From the University of Washington SPH:
http://sph.washington.edu/careers/jobs.asp

From the Centers for Disease Control and Prevention:
http://www.cdc.gov/employment/

Public Health Jobs Worldwide:
http://www.jobspublichealth.com/

Find jobs and careers in the Pharmaceutical Industry:
http://www.hirerx.com/

General Job Search Advice:

http://career-advice.monster.com/

Public Health Associations:

American Public Health Association
National Association of County and City Health Officials
Council for State and Territorial Epidemiologists
Population Association of America
Society of Public Health Education