Papers from the Greer-Heard Forum in 2010 (noted then here and here) have now been published in:
The Reliability of the New Testament: Bart Ehrman and Daniel Wallace in Dialogue, ed. Robert B. Stewart (Minneapolis: Fortress Press, 2011).
Among samples available on the Fortress website is chapter one, a transcript of the original debate between Ehrman and Wallace. Other chapters are by Holmes, Martin, Parker, Warren, Heide, Evans, Raquel. (These I have not seen as yet.)
For a brief discussion of Martin Heide's paper, “Assessing the Stability of the Transmitted Texts of the New Testament and the Shepherd of Hermas”, (pp. 111-145) see Larry Hurtado's Blog.