Many Free IQ, Career and Personality tests (and paid)
I.Q., Personality and Entrepreneurial Tests
International Personality Item Pool Representation of the NEO PI-R: An online personality test
Online Personality, IQ, EQ and Aptitude Tests
Platinum Rule Find Another Person’s Behavioral Style using four styles: Directors, Socializers, Relaters, and Thinkers
Screening for Personality Disorders (New)
Queendom.com online tests
Webhouse.Net - online questionnaires and tests

Some General tests
Are You A Director, Thinker, Relater, or Socializer? 18 Question Test
225 Tests Site. Very Popular Free + Paid tests
20 Questions You can even buy a Tee-shirt!
Love Test 40 Questions - fun not serious. Plus a few other tests
Tests, Games & Puzzles An interesting variety
A new kind of personality test which is free, fun, fast and accurate.
Simple 10 Question Self Scoring (Takes 30 secs!).
Project Implicit Are you biased, sexually or racially? Harvard University Project
Forer Personality Test 51 Question Personality Test.
Quick Personality Profile 60 Questions (3-6 mins).
Personality Disorder Test 70 Questions).
Human Resources Test 10 Questions).
All Encompassing About 10 pages of questions-takes 10 minutes.