An oldie but a goodie. It's a test created by (so it sounds, at least) political scientists in the UK that plots your political ideology on an X/Y axis. The X axis-- that's the horizontal one for the geometrically challenged-- represents the economic spectrum. Thus, people on the positive, or right, side believe in varying degrees that the government should not meddle in the market, while those on the left believe the government is obligated to provide certain basic services and ensure fair play in the marketplace.
The Y axis is related more directly to political power, specifically whether it should be located in the authorities (for those with positive scores) or in individuals (for the negatives). This is your quintessential fascists vs. hippies axis.
My score this time: -6.0, -5.23
My score 2 years ago: -6.25, -4.92
Apparently I'm slowly becoming less leftist and more civil libertarian.
They've since added some helpful info. Here they've tracked all the candidates currently running for president. I think Republican primary voters would be especially shocked to see this, though you lefties won't be so surprised. And here, even more shockingly, is the graph of the 2004 presidential election. I really think that this shows what Kerry campaigned as in the general, rather than his record as a senator, because I'm virtually positive that he's well to the left of where they put him.