American Zoo and Aquarium Association - Lists positions at zoos and aquariums that are known by this professional association
BackDoorJobs.com - Those who have a deep care for the earth and have a love for nature, the environment, education, and the outdoors—and sharing it with others—will find endless opportunities here.
Environmental Careers Organization (ECO) - Useful general information about searching for environmental careers. ECO also lists hundreds of paid summer internships on their web site (including many at U.S. EPA), and sponsors an environmental career conference each fall.
Environmental Career Center - Lists environmental jobs in ecological, natural resources, environmental science & engineering, environmental education, policy, and environmental support categories. Aimed more for the professional/graduate than the student. Web site includes news and job searching resources.
Environmental Career Opportunities - Billed as "the #1 source of environmental jobs!"
NH Dept. of Environmental Services - The NH DES has a paid summer internship program typically with dozens of internship opportunities. These positions can lead to full-time employment with the agency. Apply by using a standard state employment form, available online. The announcement usually comes out in late March each year.
Student Conservation Association - Solely dedicated to the conservation field -- many summer and semester internships
The Society for Conservation Biology - an international professional organization dedicated to promoting the scientific study of the phenomena that affect the maintenance, loss, and restoration of biological diversity.
U.S. Fish and Wildlife Service - Helpful general information about the types of careers with USFWS as well as working conditions, benefits, training opportunities, special programs, etc. Also includes links to specific vacancies, volunteer opportunities, and student employment.