Research Opportunities for Undergraduates in Mathematics and Mathematical Sciences
Summer and Semester Programs
http://www.ams.org/employment/undergrad.html#summer
Internship & Co-op Opportunities for Undergraduates
http://www.ams.org/employment/internships.htm
Summer Undergrad Program in Math
for Women
Carleton and St Olaf
http://www.math.carleton.edu/smp/
Berkeley
http://stat-www.berkeley.edu/users/sims/
George Washington University
http://www.gwu.edu/~spwm/index.html
Other Resources
http://www.math.purdue.edu/~rcp/Internships.html
Undergraduate Mathematics Majors
http://www.ams.org/employment/undergrad.html