Neo, here's a list that I've compiled for you, courtesy of my college advisor, Dr. Rumbough.
America's Job Bank
http://www.ajb.dni.us/
Campus Career Center
http://www.campuscareercenter.com/
Career Builder
http://www.careerbuilder.com/
CollegeGrad
http://www.collegegrad.com/internships/index.shtml
Monster
http://www.monster.com/
Hope this helps!
EDIT: NEW! Found this one through my aunt, who does background checks for the FBI. Hot Jobs
http://www.hotjobs.com