It's hard to know what to make of many of the career assessments out there. I leave accuracy up to the pros and largely measure based on brevity and interest. In those regards, here's a good one:
The Color Career Counselor, offered by Careerbuilder's CareerPath.com, quizzes you several times on your favorite colors and then analyzes your personality.
From Careerpath.com:
The Color Career Counselor is the world's first nonlanguage test to define occupational interests. It uses color preference to determine successful career paths. The test is based on the multi-patented Dewey Color System, which is the world's only scientifically validated color-based personality test - published in the North American Journal of Psychology.
I took the quiz yesterday and—while I'm fairly certain I changed my "favorite" more than once—it was surprisingly accurate.
It told me I'm a "creator" type. Apparently I need to express myself—often—and I value aesthetics, imagination and learning. (It also says I am impulsive and emotional, but much of those traits have been trained out of me. I think.)
As for my ideal occupations—Reporter makes the list! (As does editor; so boss, you better watch out.)

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Jon of PA 6:01PM August 20, 2009
cv of TX 8:11PM March 27, 2009
Sally Farrington of NC 2:10PM February 20, 2009