University of Missouri has a number of internship opportunities in Biology, Animal Science, Biochemistry, Chemistry, and Technology. Applications are due Feb 15, 2014. Follow this link to find more info.
Oakridge National Laboratories lists a variety of opportunities.
Department of Homeland Security has an internship program for STEM students. Apps are due Jan 6.
Gerstner-Sloan Kettering Graduate School of Biomedical Sciences has summer research internships. See their site for more information. Apps due Feb 1.
Mickey Leland Energy Fellowship Program – Apply at http://orise.orau.gov/mlef! Gain hands-on experience with Department of Energy research scientists and staff. Application closes January 15!
National Science Foundation has a variety of internship opportunities. Go to the REU opportunities site to see what experience fit your interests.