The review of Ehrman's recent book "Misquoting Jesus," by P.J. Williams last December aroused many comments. (See here.)
In one comment, C. Stirling Bartholomew, asks for "a more aggressive deconstruction of Ehrman's project." We haven't seen many attempts, but I know of one German student, Ivo Tamm who wrote his "Magisterarbeit" (equivalent to a Master thesis), Theologisch-christologische Varianten in der frühen Überlieferung des Neuen Testaments? at the Westfälische Wilhelms-Universität Münster, under Barbara Aland, which may give some direction.
The author, Mr Tamm, currently working as a translator in theology, has agreed to making his work is available for interested. I will make a mailing list and send his thesis in PDF-format to those who are interested (alternatively make it available for download), and Ivo is especially invited to participate with comments in further discussions.
So, if you would like to receive the work by Tamm, please reply to email@example.com.