"O*NET OnLine has detailed descriptions of the world of work for use by job seekers, workforce development and HR professionals, students, researchers" (source: O*NET OnLine).
Toolkit for job seekers, students, businesses, professionals. Provides information on skills, training, wages, jobs, industry, and state & local information. Sponsored by the US Department of Labor.
A career exploring and coaching site that uses O*NET data. (source: California Career Resource Network)