Patrick S. O'Donnell is posting extensive law-related bibliographies at Ratio Juris. He describes his bibliographies and provides a list here.
Any bibliography will be somewhat idiosyncratic, as O'Donnell notes, but these lists will be of great help to grad students or to anyone inching into a new research area. Below are links to his posts on recently posted bibliographies. On the blog, O'Donnell links to PDF files with the actual bibliographies:
International Law, Human Rights and Comparative Law
Criminal Law, Punishment and Prisons
American Indian Law
