the fountainhead is atlus shrugged, but with more plot and a little more editorial discipline. it was, as tvc reminded me, written before rand formulated the tenets of objectivism, and has a few more humanistic considerations. it's still godawful crap, though.
seriously. you read ayn rand simply to round out your experience with popular american "social philosophy," and to level devastating critical barrages at rand's vocal big-L Libertarian fanboys, who comprise an astonishingly disproportionate percentage of useless web forum posters.