This website is certainly not the end-all and be-all of a job search. I try to post jobs relevant to law students, but there's simply no way to get everything out there. Below are some sites you may find useful in your search:

Job Aggregators
Oodle.com
Indeed.com
Linkup.com
Juju.com
Simplyhired.com
Careerjet.com

Traditional Job Websites
Monster.com
Monstertrak
America's Job Exchange
Yahoo Hotjobs
Careerbuilder.com
Aftercollege.com
Craigslist

Non-Profit Jobs
Idealist.org
Nonprofitjobs.org
Policyjobs.net
PSLawNet

Government Jobs
USAJOBS.gov
GovernmentJobs.com
Go to the individual pages of government entities - for example, the Library of Congress has a page specifically for job listings - http://www.loc.gov/hr/employment/index.php