In comments, Sean du Toit asks if I could recommend a good introduction to Textual Criticism. Indeed I can:
David Parker, The Living Text of the Gospels (Cambridge: Cambridge University Press, 1997)
Amazon have it on "Search Inside" so you can get a good taster before buying. And it's on Google Books too, like a lot of CUP's stuff.
Incidentally, the fact that it was available for searching allowed me to try out the terms discussed in that previous blog post and comments and it seems that David is, on the whole pretty consistent in his usage: "textual criticism" x 50; "textual critic" x 7; "text critic" x 0; "text criticism" x 0; but "text-critical" x 7 and "textual critical" x 0.
Updates (Friday, 9.33): thanks to Matt Page for the corrected Amazon link for David Parker's book, now adjusted above. Thanks too to Holger and to Steve Walton for the endorsement of another useful introduction to NT Textual Criticism, which I had completely forgotten about:
J. K. Elliott and I Moir, Manuscripts and the Text of the New Testament: An Introduction for English Readers (Edinburgh: T&T Clark, 1995)
Alas, it is a bit expensive on-line, like several of the Continuum back-catalogue (including one of my own books, to my frustration); e.g. see Amazon. It is reviewed by Tim Finney on TC.