I know that these things are supposed to be viewed as silly and uninformative, but I actually think the Political Compass test is reasonably interesting. I've been taking it every couple of years at least since I started college, just to see whether and to what extent my views shift over time. I also think comparing scores between people can be illuminating, since I often assume that people, especially bloggers that I have no actual personal experience with, are more liberal or conservative than they really are.
As of today, I'm -4.38 on the economic axis and -5.49 on the social issues axis. My economic score almost never varies much, but my social score tends to vacillate a point and a half in either direction. Not sure if that's a function of my mood at the time or what, since I don't keep any record of how I answer individual questions. I'm definitely still a liberal though. Phew.