Here are some links for other summer research opportunities not offered by nor are affiliated with CBST.
National Institute of Biomedical Imaging and Bioengineering provides links for paid summer programs at various universities. These summer institute programs are mainly aimed at upper class undergraduates.
The Wellman Center is Massachutes General Hospital's center for photomedicine. Undergraduate and graduate summer internships are offered.
NASA Internships, these are undergraduate research opportunities for both summer and fall.
Council on Undergraduate Research website has information on undergrad opportunities in mathematics, science and engineering.
NIH Office of Extramural Research has summer internships as well as research fellowships for all levels of education; undergrad through post-doc. There are also high school summer internship and scholarship opportunities.
Hugh Edmondson Research internship, Department of Pathology and Laboratory Medicine, UCD Medical Center.