Check out these organizations expecting to have student internships this summer

For more information, see the following;
National Institute of Standards and Technology
http://www.surf.nist.gov/surf2.htm

National Science Foundation REU program
http://www.nsf.gov/crssprgm/reu/reu_search.cfm

Idaho National Laboratory
http://www.inl.gov/education/undergraduate.shtml

TeraGrid - Fellowships, Internships, Competitions and Awards
http://www.teragrid.org/eot/internships.html

American Chemical Society - International Research Experiences for Undergraduates.
http://portal.acs.org/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_SUPERARTICLE&node_id=2216&use_sec=false&sec_url_var=region1


DOE Computational Science Graduate Fellowship
http://www2.krellinst.org/csgf/index.shtml