Grad School Databases and General Info Sites 

Petersons.com
A graduate school database in which you can search over 35,000 graduate programs. Site also has good general information about applying to, and financing graduate school.

If you're looking for a greater variety of career options than what's provided by current graduate programs in the sciences and mathematics, then you may want to consider a Professional MS degree. Professional MS degree programs are open to bachelor's degree holders in the sciences, mathematics, or engineering. They'll prepare you for work in fields such as consulting, banking, insurance, research management and technology transfer. Professional MS degree information site

GradSchools.Com
A comprehensive online source of graduate school information.

Council of Graduate Schools
This page provides a multitude of information concerning graduate school.

U.S. News Online - .edu
You can find grad schools, advice on applying to grad schools, and scholarships on this site.

Gradview.com
This site provides search tools plus informational tools on the subject.

Career Guidance Foundation
This site provides a search for Associate, Bachelor, and Graduate programs.

US Universities
This is a listing by state of the universities in the US; it will link you to their home pages.