A philosophy graduate student elsewhere writes:
Your recent mention of "The Case of the Speluncean Explorers" (in the poll on philosophers of law) got me thinking about other "classic" legal papers. "Speluncean Explorers" strikes me as an unusually good example of a paper that has the ability to introduce undergraduate students to a lot of big ideas in the field (and it does so in an evocative way). In light of your background in the area, I would be interested in hearing what you and your readers consider to be similar papers, i.e., papers that might be used to flavor a broad array of undergraduate courses that touch upon the law. I have in mind things like "Positivism and the Separation of Law and Morals" (Hart), "Positivism and Fidelity to Law" (Fuller), "The Punishment that Leaves Something to Chance" (David Lewis), "Persons and Punishment" (Herbert Morris), and so on.
Personally, I would not teach "Positivism and Fidelity to Law," since it's just a tissue of confusions that does nothing to illuminate legal positivism or relevant objections to it. In any case, this is open for reader suggestions. (Comments may take awhile to appear, please be patient.)