Free Jung Personality Test (similar to Myers-Briggs)
And here I am:
ISTJ - "Trustee". Decisiveness in practical affairs. Guardian of time- honored institutions. Dependable. 11.6% of total population.
I still test as 50/50 Introvert/Extrovert, but I know I am an introvert. If I am around people for too long, I have to go be by myself for awhile.