Project Nature Connect - Jobs, courses and degree programs with a nature focus.
Earth Science World - Investigate careers in geoscience, job opportunities, and degree programs.
North American Assn. for Environmental Education - 5800 links, 300 categories. Professional development, lesson plans, events, jobs, classroom activities, etc.
The Student Conservation Association - a nationwide force of student volunteers who protect and restore America’s parks, forests, and other public lands.
Job-Hunt.org - Jobs, professional associations, articles, tips, terminology and glossaries.
Society for Environmental Journalists - News, journals, conferences, industry trends, and a mentor program!
Jim Cassio - Marvelous resources including a free 76 page downloadable Green Career Resoure Guide.
EarthWorks - This is primarily a jobs site, but it has a fantastic list of links.
The Ecological Society of America - Career and job information, internships, training, certification; wonderful profiles & advice from professional ecologists.
OceanCareers.com - Descriptions of 50+ ocean occupations, competencies needed, training institutions and 200+ links to professional associations.
Green Design/Sustainable Architecture - Cal's comprehensive links to articles, journals, indexes, potential employers, etc.