Last month Larry Hurtado informatively reviewed this book:

Charles E. Hill and Michael J. Kruger, eds. The Early Text of the New Testament. Oxford: Oxford University Press, 2012.

Hurtado writes,

In the last couple of weeks, I’ve taken the time to work through the volume (21 contributions, and over 400 pp.), and I have to underscore how impressed I am with it.  In the following comments, I highlight contributions that I found particularly valuable. . . .

This volume (though expensive!) is now probably the most up to date analysis of earliest evidence about the state and transmission of NT writings in the second century CE. Given the limitations of our evidence, scholars are required to make the best inferences they can. This volume provides essential resources in doing so, and largely shows that we can with some confidence posit that the NT writings, essentially as we know them, were copied for both ecclesial and private reading.