Careers for Math Majors
Review the websites below for nonacademic job opportunities for mathematics majors:
 Society for Industrial and Applied Mathematics  Careers & Jobs
 American Mathematical Society Programs for Graduate Students
 American Mathematical Society Programs for Undergraduates Mathematics Majors
 Society of Actuaries
 AMS Employment Services for PhD Mathematicians
 Should You Prepare Differently for a Nonacademic Career?

Occupational Outlook Handbook by the Bureau of Labor Statistics (Check out the section on Mathematicians)
Check out a website maintained by Luchsinger Mathematics listing all sorts of job opportunities for mathematicians all over the world (including the US)!!
On a related matter, see Agnes Scott College's wonderful history of women in mathematics.