One of the intractable problems in TC research is the Book of Acts. Larry Hurtado has a stimulating post on Rethinking the Text of Acts in light of a recently published 5th century manuscript P.Oxyrhynchus 74.4968 (Gregory-Aland P127), comprising portions of eight leaves preserving portions of Acts 10–12 and 15–17. He refers to the volume by David C. Parker and Stuart R. Pickering in The Oxyrhynchus Papyri, Volume LXXIV, ed. D. Leith, et al. (London: Egypt Exploration Society, 2009) that discuses the manuscript. In short, the discovery shows that the bifurcation between the Alexandrian and Western text of Acts needs to be re-thought since P.Oxy 74.4968 probably shares a common ancestor with Codex Bezae even though the texts are not particularly close.
For an introduction to the problems associated with the text of Acts see Peter M. Head, “Acts and the Problem of its Texts,” in The Book of Acts in its Ancient Literary Setting (eds. B.W. Winter & A.D. Clarke; Grand Rapids: Eerdmans & Carlisle: Paternoster, 1993), 415–444.
Up-date: There is a scanned version of this paper here (PMH).