Compiled in March 2012 especially for those seeking entry-level positions in ecology and conservation biology. Happy hunting!
These first four are SUPER job boards with all manner of field tech, research assistant, preserve manager, land trust, grad student assistantship, and land management positions.
Also good ones
http://www.nsf.gov/crssprgm/reu/reu_search.cfm NSF Research Experience for Undergraduates. These programs are paid summer research internships, generally for rising juniors and senior. A competitive application process, but great experience.
https://listserv.umd.edu/archives/ecolog-l.html Ecolog list serve has many job postings and other tidbits on ecology, in general.
http://www.landtrustalliance.org/about/jobs/land-trust-jobs -land trust jobs
http://www.worldwildlife.org/who/careers/jobs.html -jobs with WWF, including a few internships
http://jobs.oriongrassroots.org/ -more varied, general environmental types of jobs (policy, education, advocacy, farming, etc… less ecology)
http://pin.primate.wisc.edu/jobs/list/avail –primate ecology and behavior field and lab jobs including many volunteer field positions
USAjobs.gov-MANY government park ranger, biological field technician jobs. BUT, the hiring process can be slow.
http://www.sws.org/jobs/ -Society of Wetland Scientists job board with some entry level positions, including private consultant jobs.
http://www.zeroextinction.org/parnters.html –A consortium of organizations working on issues to do with endangered species and extinction, but many of the listed groups will have job boards.
http://www.bgsu.edu/departments/biology/ecology/ecology_jobs.html –Bowling Green State University’s list of job sites for ecologists-in-the-making.
Indeed.com and other general job search engines can turn up a few useful openings, too.