Gregg Allison's Historical Theology: An Introduction to Christian Doctrine would be an excellant edition to Logos, especially since it is billed as a companion volume to Grudem's Systematic Theology (It was also written to stand on its own). Many of us already have Grudem, so this volume would be extremely helpful in tracing the theological development of the doctrines in Grudem's Systematic Theology. This book is not released yet, but it would be nice for Logos to get a jump start on this promising volume.