I found the following test from Malcom Gladwell's Blink. It's a book about the unconsious, split second judgements that guide our descisions.
None of us think they are racist. And in truth, most of us aren't. But what about the unconsious prejudices? Take the following test. Go to www.implicit.harvard.edu, the demonstration, the "Race IAT" and let's be honest about our scores, shall we? Take it twice. I did. After a few of us have taken the test I'll share my results.