The Checks and Balances of Armed Self-Preservation. Synposis says it gives an analysis of the division of armed defensive forces within the modern system of checks and balances in American government. Discussion of possible analogies to be drawn from that division of force for interpreting the Second Amendment and whether it creates an individual right to keep and to bear arms or only a collective right to armaments in organized military units such as the National Guard.
And Randy Barnett's upcoming article The People or the State?: Chisholm v. Georgia and Popular Sovereignty is online. Chisholm was the Supreme Court's first big con law case, and held that States were subject to suit in federal court (notwithstanding the argument, made in the Federalist Papers, that sovereign immunity would block this -- and a result overridden by the 11th Amendment).
Prof. Barnett's article asks why this case is usually overlooked in teaching con law. (If I remember correctly, when I was taught it the case got about 2-3 sentences, this is what it held, and the 11th Amendment resulted).