America's Job Bank is the biggest and busiest job market in cyberspace. Job seekers can post their résumés and employers can post job listings or search résumés automatically. Jobs can be searched by title or keyword. There is also a link to state jobs and employment information.
FedWorld.gov
This database allows you to search abstracts of open U.S. Federal Government jobs. Databases are updated daily.
Occupational Outlook Handbook (2008-2009 Edition)
From the Bureau of Labor Statistics, the Occupational Outlook Handbook is revised every two years, has easy-to-follow search instructions. The Handbook describes what workers do on the job, working conditions, the training and education needed, earnings, and expected job prospects in a wide range of occupations.
O*NET OnLine
O*NET is a unique, powerful source for continually updated occupational information and labor market research. The O*NET database includes information on skills, abilities, knowledge, work activities, and interests associated with occupations.
students.gov
Student Gateway to the U.S. Government. Includes information on planning one's education, student aid, career development, community service, jobs and military service.
USAJobs
From the U.S. Office of Personnel Management, USAJOBS is a database of more than 15,000 federal jobs and employment information. In many instances, you can apply for positions online or submit a résumé. Updated daily.