The following links have been selected to give quick access to several career interest inventories.
Kiersey Temperament Sorter-II 
This assessment is an Interest Inventory designed for career and personal planning. The initial survey is free but additional reports are fee-based.
O*Net Computerized Interest Profiler
A free resource with assessment information that can be printed for use or accessed via free downloadable software. O*Net is developed under the sponsorship of the U.S. Department of Labor/Employment and Training Administration and leads a partnership of public and private sector organizations.
SkillsOne.com
A subscription-based collection of assessments including the Myers-Briggs Type Indicator and Strong Interest Inventory.
The Career Key™
Gives you professional help in choosing a career, making a career change, and choosing a college major or training program.
WOIS/The Career Information System
Includes a Career Interest Survey as well as several other services but requires a site license to use.