O*NET Resource Center onetcenter.org
This is a database, made available by the U.S. Dept. of Labor, that provides descriptive information for more than 900 occupations. Each description includes skills, abilities, knowledge, tasks, work activities, work context, experience levels required, job interests, work values/needs, and work styles.
Occupational Outlook Handbook bls.gov/oco
It's the online version of the handbook. The Occupational Outlook Handbook is a nationally recognized source of careeer information, designed to provide valuable assistance to individuals making decisions about their future work lives. Each occupation's description includes: the training and education needed, earnings, expected job prospects, what workers do on the job, and working conditions.