For Undergraduates:
Paid Summer 2011 Undergrad Research Placements:
Over 400 programs - REU and Other Summer Research Opportunities for
Undergrads
http://www.pathwaystoscience.org/Summerresearch.asp

For Financial Support in Graduate School Opportunities:
Bridges, GK-12, IGERT and NSF Grad Research Fellowship programs provide
generous stipend and tuition support for students through the National
Science Foundation:
http://www.pathwaystoscience.org/Grad.asp

For Postdoc opportunities:
http://www.pathwaystoscience.org/Postdocs_portal.asp

For NASA-supported internships, fellowships and scholarships:
http://intern.nasa.gov/