Duke Newt's very own Nathan Eubank has a new article out in the latest JBL 129/3 (2010): 521–536.
A Disconcerting Prayer: On the Originality of Luke 23:34a
Besides making a persuasive case for the long reading of Luke 23:34 (Father, forgive them, for they do not know what they are doing), Eubank also demonstrates the important (and so often ignored!) methodological point that "if the goal of transcriptional probability is to determine what a scribe is most likely to have written, it would seem prudent to examine what the scribe’s near contemporaries wrote about the passage in question" (536).
Eubank's article is an excellent example of the importance of the history of exegesis for textual criticism.