Here are a some web resources designed to help you locate an internship opportunity. There are many more.
InternHelpMe.com is managed by the Maine State Chamber of Commerce, and connects college students with employers in Maine.
CareerRookie is an internship site with a highly developed search engine.
USAJobs offers internships by the federal government across all fields and majors. A great place to start exploring federal internships is by searching under the categories of Student Career Experience, Student Temporary Employment and Summer.
Internships.com is devoted solely to internships and provides excellent services and resources. Interships.com maintains the largest database of internship opportunities in the world.
getthatgig.com is another site with a comprehensive listing.