I began my tenure as a right-wing libertarian by reading Ayn Rand, who dissuaded me from the rather muddled left-wing sympathies I held at the time. I was only a Rand enthusiast for a short time, however, and I soon developed an interest in the "more reasonable" free-market thinkers, such as von Mises, Nozick, Hayek, David Friedman, etc. I was an ardent supporter of unimpeded and "stateless" capitalism for the course of almost 3 years, and developed and/or adopted every possible philosophical and economic justification that can be conceived of for its defense.
h/t for the above to Check Your Premises
See also The political path of a freethinker at db0's blog.