Opinio Juris is hosting a book symposium on Investment Law in International Law: Integrationist Perspectives (Freya Baetens ed. 2013). Check out the related discussions on http://opiniojuris.org/category/special-content/book-discussions/.
Harvard International Law Journal
The oldest and most-cited student-edited journal of international law, the Harvard International Law Journal covers a wide variety of topics in public and private international law.