U. S. Supreme Court Multimedia Database -- The Oyez Project at Northwestern University is maintained with assistance from the National Endowment for the Humanities. Through this site one can gain access to the texts of cases, as well as RealAudio recordings of the oral arguments.
J. M. Dawson Institute of Church-State Studies -- The oldest and most well established facility of its kind located in a university setting. It is exclusively devoted to research in the broad field of church and state and the advancement of religious liberty around the world.
RJ & L Religious Liberty Archive -- An extensive repository of valuable information and a useful resource for anyone seeking information about state and federal laws pertaining to religious freedom in the United States. View other Religious Liberty cases, commentaries, federal statutes, state constitutions, and important historical materials relevant to religious freedom in the United States.
Rutherford Institute -- A civil liberties organization that provides free legal services to people whose constitutional and human rights have been threatened or violated. The Institute’s mission is twofold: to provide legal services in the defense of religious and civil liberties and to educate the public on important issues affecting their constitutional freedoms.
Francis Beckwith -- An instructor at Baylor University.
Church & State Bibliography -- Edited by Charles Bellinger.
Church & State in American History -- A 2011 course by Scott Seay at Christian Theological Seminary.