I'd like to see the following resource in Logos format:
The Encyclopedia of Christian Literature (2 Vols), edited by George T. Kurian and James D. Smith III
"Covering 2,000 years, this two-volume set is the first encyclopedia devoted to Christian writers and books. In addition to an overview of Christian literature, this encyclopedia includes more than 40 essays on the principal genres of Christian literature and more than 400 bio-bibliographical essays describing the principal writers and their works."
I, er, um, have a slight bias. I wrote the entry on Walter Wangerin in this encyclopedia. I still haven't seen it yet -- it's that hot off the press.
Some existing Logos resources cover theologians and classical authors of the past quite well. But this will be a goldmine for info on more recent authors, and ones of a more literary bent (it includes, for example: George Herbert, Dorothy Sayers, Annie Dillard, Gerard Manley Hopkins, Flannery O'Connor, Corrie Ten Boom, Scott Cairns, Rick Warren, Leo Tolstoy, Ron Sider, C.S. Lewis, Susan Howatch, Elizabeth Elliott, Jacques Ellul, and many, many more...)