The Political Compass
This online test is produced by a UK journalist, and it's very UK like. It's fairly clear what the "right" answers are, and how an awful Republican might answer. The "wrong" answers are phrased in such a way that it's hard to imagine even GWB really getting a "bad" (authoritarian) score.
I ended up being left-libertarian. Just to the left of Jean Chretien and the right of the Dalai Lama, but about as libertarian as the Dalai Lama. So I guess I'm in happy company.