The NY Times has a nifty, simple interactive tool where you can answer six questions and see how your personal opinions on important issues match the nine justices of the US Supreme Court and wider US popular opinion.
Check it out here:
http://www.nytimes.com/interactive/2010/07/25/us/scotus-quiz.html?ref=us
My opinions produced this verdict: "In these six cases, your opinions were most closely aligned with the center of the court."
What a relief! I'm a centrist!