USAJOBS - Searching for jobs and applying to the Federal Government. All National Weather Service positions come through this site. You should create a resume. A good place to start.
National Weather Association Job Corner. Excellent list. The most recent postings are at the top.
American Meteorological Society Employment Announcements. You should be a member of the AMS in any case.
Environmental Jobs. This is much broader than just meteorology. Many good links to other lists here.
UCAR current listings. Another large employer of meteorologists. (UCAR is in Colorado)
New York State Department of Environmental Conservation The link to their job list is at the bottom.
Air and Waste Management Association job site If you are interested in a job in air pollutionEarthWorks. This is international with all kinds of jobs requiring various levels of expertise.
Private forecasting and consulting firms employ a lot of meteorologists. This link is a list from the NWS. It may be outdated. Often if you contact a firm they will tell you if they are hiring.