Although this is designed for students, there are aptitude and career interest tests that may be very helpful to adults as well. This is a good place to start. Government Postal Jobs Offers postal jobs kit for those looking to pass postal exams for US postal service jobs.
Searches are fast and easy.
Student Center Helps identify strengths, career goals and learn about those companies that best match your interests. An extremely resourceful site for building your career and finding a job. Career Mosaic Another big player of the job sites. Heavily used by recruiters where more than 36,000 people have posted their resumes. This site is is deep in career resources and includes job descriptions.