I’ve just, at last, got hold of a printed copy of the revised version of An Introduction to Gödel’s Theorems which came into stock with CUP about six weeks ago. Of course, as soon as it went to press, three or four people told me of errors that still need correcting! — but this version has significantly fewer typos, and also a small number of passages have been improved. The corrections page at the book’s website will tell you what’s been changed, and what still needs changing.
(So, tell your libraries that they just must have the shiny new improved version! And to answer Richard Zach’s question — the quick way of telling the versions apart is to glance at the imprints page, i.e. the verso of the title page. The later version notes, halfway down the page, “Reprinted with corrections 2008”.)