David H. Warren, Ann Grahman Brock, and David W. Pao, Early Christian Voices in Texts, Traditions, and Symbols: Essays in Honor of François Bovon, Biblical Interpretation Series 66 (Leiden: Brill, 2003).
Contains 32 studies from well-known scholars on subjects ranging from Q, Thomas, Luke, second-century movements, exegesis and hermeneutics in apocryphal texts, and unpublished ancient manuscripts. Particularly interesting to me is Morard's contribution which is a critical edition of a Coptic Apostolic Homily. But there are many more fantastic articles, so be sure to at least check it out of the library (it is a pricey Brill volume).Anthony Hilhorst and George H. van Kooten, The Wisdom of Egypt: Jewish, Early Christian, and Gnostic Essays in Honour of Gerard Pl Luttikhuizen, Ancient Judaism and Early Christianity 59 (Leiden: Brill, 2005).
This volume has a entire section devoted to Gnosticism including Mani, magical practices, and NH text studies. The other two sections cover early Christianity in Egypt and Judaism in Egypt. So this is another very good volume to check out (and another pricey Brill book!).