This journal, which you can access here, is devoted to historiographical surveys of the field. Here are some medieval articles from recent issues:
May 2008
Rome's Final Conquest: The Barbarians, by Walter Goffart
The Prehistory of the Crusades: Toward a Developmental Taxonomy, by Burnam W. Reynolds
An Introduction to Medieval Environmental History, by Ellen F. Arnold
Teaching & Learning Guide for: Teaching the Middle Ages on Film: Visual Narrative and the Historical Record, by Martha Driver - you can freely read this article here
March 2008
Kabbalah: A Medieval Tradition and Its Contemporary Appeal, by Hava Tirosh-Samuelson
Postcolonialism and the Study of the Middle Ages, by Nadia R. Altschul