Yahoo Hot Jobs, Career Assessment
http://hotjobs.yahoo.com/assessment
Take an assessment test to determine the right career choice for you.

Career Explorer
http://www.careerexplorer.net/aptitude_test.asp
Discover your strengths, your styles for communications, learning and leadership. See what career is best for you.

Monster.ca
http://assessment.monster.ca/
Self-assessment is a great way to get to know yourself and can be essential preparation for a job search, for interviews and for negotiations.