Here is a collection of links that illustrate many of the job opportunities if you have a math degree.

AMS Profession Guide - Some basic information from the AMS about mathematics.

AMS Career Services - A nice collection of services from the American Mathematical Society including job listings.

Mathematics in Industry - A report from SIAM (Society for Industrial and Applied Mathematics) about math careers outside of an academic environment.

Careers in Statistics - Career information from the American Statistical Association.

Be An Actuary - Information about actuary careers.

Informs Online - Career information from the Institute for Operations Research and the Management Sciences.