Most of all, I've become more moderate, and also more conservative, I mean that word in its literal rather than partisan sense. Living in Germany for a year, in the mid-1980s, was a big influence. I don't think the U.S. should try to copy those institutions, but it did make me more of a "every country is different" sort of guy. I also, over time, have come to see civilization as more fragile than I had thought. So if a set of institutions shows some ability to keep a civilization going, we ought to have (critical) respect for what has been accomplished, and not always be so quick to suggest radical changes.
My paper "When Are We Being Too Utopian?", found on my home page, is a very good place to start for understanding my political views.
That all said, my core instincts are still quite libertarian.