This is such an interesting study. I took one of the tests and it was fairly accurate and disturbing.

"Created by psychologists at Yale University and the University of Washington, this collection of Implicit Association Tests (IAT) measures unconscious bias. We invite you to test yourself and reveal what may be lingering in your psyche. Each test takes about five minutes, and your privacy is protected -- no identifying information is collected or distributed.
Your test results may disturb you -- more than one million tests have been taken and the majority reveal unconscious bias. Dig Deeper into the science behind the tests, into stereotypes and prejudice, and into the societal effects of bias. Read the IAT tutorial. "

"Created by psychologists at Yale University and the University of Washington, this collection of Implicit Association Tests (IAT) measures unconscious bias. "

This is thought provoking. Having said that, I have serious problems with it. I posted about it earlier a little a head of the gun. Basically, you develop a strategy for approaching the test. Sometimes you can come up with good strategies, some times you cannot. That strategy may or may not have anything to do with a racial prejudice. That strategy may or may not reflect a real belief that you have. This site implies both, and furthermore, if you "win" by getting a neutral result they reply with a long list of reasons why you may have taken the test incorrectly.