The Conrad Grebel Review is an interdisciplinary journal of Christian inquiry devoted to thoughtful, sustained discussion of spirituality, theology and culture from a broadly-based Mennonite perspective. The Review is published three times a year. Each issue usually contains refereed scholarly articles, responses to articles, informal reflections and book reviews.
If you look in the "Past Issues List" they have many of their issues from 1998-2007 available for download, including special issues devoted to theologians like Stanley Hauerwas, John Howard Yoder and Miroslav Volf. They also have a special issue on Nonviolence as a viable response to terrorism that I'm looking forward to reading.