These tests are pretty arbitrary as to your precise position on the ideological spectrum. Do one's views on gay marriage get weighted just the same in the outcome as whether one thinks parents should use spanking as a form of discipline? Weighted more? Less? How much so? But the tests do tend to capture roughly where people stand. Besides, they're fun.
I came out a +2.00 on the economic issues scale (that's slightly right of center) and -3.38 on the social issues scale (that's libertarian, a word I would not use to describe myself, but only slightly so). Pretty boring: I'm basically a moderate according to this test, certainly less libertarian than either Andrew Sullivan or, I'm guessing, most of my fellow VC bloggers.