American Institute of Biological Science http://www.aibs.org
Chesapeake Bay Foundation http://www.cbf.org/
Cyber-Sierra's Natural Resources Job Search www.cyber-sierra.com
Ecological Society of America www.esa.org
Environmental Career http://www.environmentalcareer.com/
Environmental Career Opportunities www.ecojobs.com
Environmental Careers Organization www.eco.org
Environmental Expert www.environmental-expert.com
Environmental Health Perspectives www.ehp.niehs.nih.gov
Environmental Industry Association http://www.environmentalistseveryday.org/
Environmental News Network http://www.enn.com/
Environmental Protection Agency www.epa.gov
Green Dream Jobs www.sustainablebusiness.com/jobs
Marine Biological Laboratory www.mbl.edu
Local Government Environmental Assistance Network http://www.lgean.org/
National Association of Environmental Professionals http://www.naep.org/
National Council for Science and the Environment www.ncseonline.org
National Wildlife Federation www.nwf.org
NewScientist Jobs www.newscientistjobs.com
North American Association for Environmental Education www.eelink.net
Sierra Club http://www.sierraclub.org/ 
Student Conservation Association www.sca-inc.org
Water Environment Federation www.wef.org
Wildlife Conservation Society www.wcs.org
World Wildlife Fund http://www.worldwildlife.org