Professional Organizations:
AMS - American Mathematical Society (undergraduates)
MAA - Mathematical Association of America (undergraduates)
Texas Section of the MAA
SIAM - Society for Industrial and Applied Mathematics (undergraduates)
AWM - Association of Women in Mathematics (students)
Pi Mu Epsilon - Mathematics Honor Society
NSF - National Science Foundation information for students

Lamar Links:
Lamar Mathematics
Lamar University
College of Graduate Studies
Admissions
Scholarships
Financial Aid

Information:
Career information for Math Majors
Link to other Math departments
Combined Membership List
Undergraduate information - Math Archives

Opportunities:
REU - Research Experience for Undergraduates
Summer Undergraduate Laboratory Internships
PROMYS - Volunteer to be a camp counselor
Program for Women in Mathematics
Internships with the National Security Agency - NSA
Council on Undergraduate Research

Fun Stuff:
Mathematical Fiction
Math in Movies
Common Math Errors
Mathematics Genealogy Project
Mathematical Quote Server
Today in Mathematics