Laserman,
I assume the two books you already have are Progressive Dispensationalism and Dispensationalism, Israel and the Church, both by Blaising/Bock and published in the early 1990s. Robert L. Saucy, another leading progressive dispensationalist, wrote a book about the same time called The Case for Progressive Dispensationalism.
Herbert Bateman's book, Three Central Issues in Contemporary Dispensationalism (Kregel Publications, 1999) is insightful for understanding differences between traditional/progressive dispensationalists today. It presents essays on key issues and includes responses to the essays.
Craig Blaising's Three Views on the Millennium and Beyond (Zondervan, 1999) compares premil (Bock), amil (Strimple) and postmil (Gentry) views along with responses to each. Darrell Bock did write a 2 volume exegetical commentary on Luke (Baker Book House, 1994-96). Dyer/Zuck Integrity of Heart, Skillfulness of Hands: Biblical Leadership Studies in Honor of Donald K. Campbell (Baker Book House, 1994) has a couple of essays which touch upon progressive dispensationalism. Of course "Bibliotheca Sacra" - Dallas Seminary's journal - has a good number of articles about progressive dispensationalism throughout the 1990s.
If you are looking for critiques of progressive dispensationalism:
Willis/Master Issues in Dispensationalism (Moody Press, 1994) is a series of essays which defend the traditional dispensationalist point of view. Ryrie's Dispensationalism (Moody Press, 1995) addresses progressive dispensationalism in one of the chapters. This is in the revised/updated book, not the earlier 1965 version. Journals which are critical of progressive dispensationalism include Tyndale Seminary's "Conservative Theological Journal" and the "Master's Seminary Journal". The last two journals are available online (last I checked). Here are a few articles specifically on PD:
Couch, Mal. “Progressive Dispensationalism: Is Christ Now on the Throne of David?, Part I.” The Conservative Theological Journal, 2 (1998).
Nichols, Stephen J. “The Dispensational View of the Davidic Kingdom: A Response to Progressive Dispensationalism.” Master’s Seminary Journal V7, Fall 1996.
Thomas, Robert L. “The Hermeneutics of Progressive Dispensationalism.” Master’s Seminary Journal V6, Fall 1995.
If you are looking for someone to ask questions (or clarify) anything about progressive dispensationalism, then feel free to ask me, either in the forums or in PM. I've been a progressive dispensationalist since 1991, I've read the books and articles and I understand the issues.
Lamorak Des Galis
