Here are some links to keep in touch with your peers
News for Students
http://www.ams.org/news-for-students/
Research opportunities for Undergraduates
http://www.ams.org/employment/undergrad.html#summer
MAA Regional Undergraduate Mathematics Conferences
http://www.maa.org/rumc/
The Math Forum @Drexel
http://mathforum.org/library
The Math Circle
http://www.themathcircle.org/
Women and Mathematics Network
http://www.maa.org/wam/
Undergraduate Mathematics Majors
http://www.ams.org/employment/undergrad.html
Guidelines for Programs and Departments in Undergraduate Mathematical Sciences
http://www.maa.org/guidelines/guidelines.html