Earthworks Jobs
Environmental Careers World Jobbank
Jobs for the Academic Community
PaleoNet East
PaleoNet West
Society for Ecological Restoration International
Global Museum Jobs
Museum Careers
MuseumNet UK
Committee for the National Institute for the Environment
Detroit Public Library Career and Employment Center (search by profession)
Environmental Jobs and Careers
Government jobs
Marine Conservation Biological Institute
Ornithological Societies of North America
American Zoo and Aquarium Association
Association of Science and Technology Centers
Environmental Career Opportunities page
Government jobs
Museum Employment Resource Center
Museum Resource Board
National Audubon Society
Outdoor JobNet
Preserve/Net
Academic Employment Network
Academic Position Network
The Chronicle of Higher Education
Education Week on the Web
Educational Consultants job list
Higher Education Jobs
Independent School Management
Independent Schools Association of the Central States
Nation Job Network
School Spring
Teachers at Work
A general listing of teaching jobsites
Arizona Parks & Recreation
Massachusetts Audubon Society
Minnesota SEEK jobs
Ohio Parks & Recreation
Texas museum jobs
Exploratorium (San Francisco)
Monterey Bay Aquarium (Monterey)
The Tech Museum of Innovation (San Jose)
Mystic Aquarium (Mystic)
The Science Center (Hartford)
Miami Museum of Science (Miami)
Maine Aquarium
Shoals Marine Laboratory (Appledore Island)
Ecotarium (Worcester)
Museum of Science (Boston)
Nature's Classroom
New England Aquarium
Cornell Laboratory of Ornithology (Ithaca)
Appalachian Mountain Club
The Sciencenter (Ithaca)
The Ross School
Oregon Museum of Science and Industry (Portland)
Academy of Natural Sciences (Philadelphia)
Pocono Environmental Education Center (Dingmans Ferry)
Montshire Museum of Science (Norwich)
Danville Science Center (Richmond)
A final note: these references are not in any particular order. I've simply added them as I found them.