This site has links to various web sites that list job and internship opportunities. It includes links to Pennsylvania state agencies, federal agencies, scientific societies, non-profit organizations, and university career sites. Some of these sites also list graduate education opportunities.

General information:
        * Shippensburg University Career Development Center can help you with application processes,
            interviewing skills, resume writing, grad school information, and much more.
        * some sites haveemail sign-ups that allow you to subscribe to informational mailings regarding job and
            otheropportunities
        * internships may also be called summer employment, or student positions
        * not all internships are paid
        * there are also several links to grad school information and advice

Government Listings:

          Pennsylvania Department of Conservation and Natural Resources
        Jobs, internships, and volunteer positions.

Pennsylvania Department of Environmental Protection
Jobs and internships.

Pennsylvania Fish and Boat Commission
Job and internship information.

Pennsylvania Game Commission
Jobs and internships.

Pennsylvania State Civil Service Commission
Lists all state government jobs available in PA and how to apply for them. Most of the "environmental" jobs will be listed under "Engineering and Environmental Control".

United States Government Job Index and USAJOBS
Search for federal jobs by keywords or state, includes summer positions.

Studentjobs.gov
Federal job database and resume service designed especially for students.

United States Department of the Interior
Jobs and internships.

United States Geological Survey
Jobs and internships. In spite of the name, the USGS hires a lot of biologists.

United States Environmental Protection Agency
Jobs and internships. Also for more internship, job, or career info.

United States Forest Service
Internships and career opportunities. 

          Texas A&M Dept of Wildlife, Fisheries, and Environmental Sciences
        Jobs, internships graduate school opportunities.
        This site is considered by many to be one of the best sources of opportunities.

Yale School of Forestry and Environmental Studies
Links to sites with environmental employment opportunties.

Student Conservation Association
Summer internship and volunteer opportunities, sign up for monthly newsletter.

Environmental Career Opportunities
Environmental career and internship opportunities.

Environmental Career Center
Job and internship listings. If the link doesn't work, try this one.

EcoEmploy
List of organizations with environmental job opportunities.

ECO.org
Job and internship listings.

Cyber-Sierra's Natural Resources
List of employment opportunities by category, includes summer positions.

Student Central
You will have to register and log-in, but it has numerous job opportunities in the public and private sectors.

Society for Conservation Biology
Postings of various companies with job opportunities in conservation science.

Ecological Society of America
Job and internship listings, ecological career resource information.

Partners in Amphibian and Reptile Conservation
Herpetology jobs and internships.

The Nature Conservancy
Employment opportunities page. Volunteer opportunities.

American Society of Limnology and Oceanography
Job, internship, and graduate school listings.

Society of Wetland Scientists
Job, internship, and graduate school opportunities, wetland related.

American Fisheries Society
Job and graduate school opportunity listings and links.

Chesapeake Bay Foundation
Employment and internship opportunities.

Smithsonian Environmental Research Center
Internship and job opportunities.

Sea Grant's Marine Information
Information for marine careers, and related links for internships and employment opportunities.

Aquatic Network
Job opportunities.

EE Link
Jobs in environmental education.

SustainableBusiness.com
"Green" jobs listings.

GreenBiz.com
Listing of "green" jobs.

Idealist.org
Listing of career and internship opportunities with non-profits.

National Registry of Environmental Professionals
Job opportunities.

Society for Ecological Restoration
Job listings.

River Network
Jobs and internships in river conservation.

GIS Jobs Clearinghouse
Listing of jobs involving Geographic Information Systems

Pysiological Ecology Secton of Ecological Society of America
Jobs, graduate assistantships, and internships in Physiological Ecology.

Green Corps
College graduates can apply for a paid year long training session that advances your career in the environmental leadership area.