This is only a sampling of the sites which may be helpful. You can find other listings that are relevant to your interests by doing a web search.

• American Geophysical Union (AGU) page of careers links
• American Geological Institute (AGI) Geoscience Workforce Program; AGI Geoscience Careers information; AGI Geoscience Currents - status of the geoscience workforce
• Geological Society of America careers information
• The Environmental Careers Organization
• The Association For Women Geoscientists
• Newsgroups which can be searched for combinations of key words like "jobs" plus "environmental" or "geology"
• Carleton College Career Center page for job searches