PhDs.org 
Career information and job listings for post doctorate graduates in Science Math and Engineering field. Offers information on graduate schools in the science fields.
http://www.phds.org/Research Experience for Undergraduate (REU) Program
The National Science Foundation makes possible a number of opportunities for undergraduates to participate in research projects each summer. The exploration sites are established in various fields of science, mathematics, and engineering.
http://www.nsf.gov/home/crssprgm/reu/start.htm
Career Cornerstone
a resource center for those pursuing careers in engineering, mathematics, information technology, and the physical sciences.
http://www.careercornerstone.org/
Science and Engineering Workforce Project
A network of labor economists and other researchers studying the professional development, deployment, and productivity of scientists, engineers, and highly skilled technical workers.
http://www.nber.org/~sewp/
Science's Next Wave
On-line career resources for young scientists, students and graduates.
http://nextwave.sciencemag.org/
About: Science Job Searching
Offers science jobs, employment information and career resources.
http://www.jobsearch.about.com/od/science/
ScienceCareers.org
Searchable database of jobs, sorted by field specialty. Can post resume and curriculum vitae. Includes tips for improving the workplace for employers and employees.
http://sciencecareers.sciencemag.org/
Mums in Science
A resource for busy mothers working or wanting to return to work in science fields. Offers information about workshops, career development, and new discoveries.
http://www.mumsinscience.net/blog/index.xml
