I just received my copy of Evangelicals and Empire: Christian Alternatives to the Political Status Quo, edited by Bruce Benson and Peter Heltzel (with a Foreword by Nicholas Wolterstorff and an Afterword by Michael Hardt and Antonio Negri). It's an eclectic, big tent collection, since it includes an essay like Jim Wallis' "Dangerous Religion: George W. Bush's Theology of Empire" (ch. 1) and my own, "The Gospel of Freedom, or Another Gospel? Theology, Empire, and American Foreign Policy," which would be critical of Wallis' habit of continuing to connect "empire"-talk to a particular nation-state. Other contributors include John Milbank, Gail Hamner, Corey Walker, Amos Yong, Michael Horton, and many others.
Kudos to Bruce and Peter for managing to get Hardt & Negri to provide some (albeit brief) feedback on the collection.