Are you racially biased? Harvard University has been trying to find out with its racism test, Project Implicit. The less than 10-minute test throws different races at you and has you identify the images as "bad" or "good" as quickly as you can. The idea is that your first reaction is usually the most honest.
You can try the test out for yourself. Simply click on the "Demonstration" button and then click the "Race IAT" button.