By "Biblical inerrancy" Christians are referring to the original manuscripts. The issue, of course, is whether the Bible can be reconstructed via textual criticism as to be basically reliable for knowing the gospel and having a relationship with Christ. Of what I've read of Bart D. Ehrman's work, it seems to be a rehash of what scholars have already been dealing with for quite some time, much of it simply made popular and accessible. I haven't seen anything that would shake a basic trust in the reliability of what reconstructions Biblical scholars put together in modern translations.
http://www.theopedia.com/Inerrancy