While I think it's critical that people inspect their implicit associations as a way of confronting the things we are quietly in our culture, I don't think that having a difference in these reaction times indicates you're a "racist". How you act determines whether you are racist; what your subconscious tells you is a piece of this but not the whole story.

Understanding your subconscious is a way of being LESS racist, I think, and I worry that people who see these tests as "am I racist?" tests are less likely to do the important risk of taking them.