Check out the Implicit Association Test at Understanding Prejudice (link via Jim Buie). The test purports to determine the taker's preference -- either for white people or black people -- and to say roughly how strong that preference is. If you take the test, come back and discuss it in the comments -- I'm curious to hear what the BlueNC community thinks of it.
EDIT: I posted before seeing the next post on Jim's blog, "Does Racial Prejudice Predict Voting?" One word: yikes!