My editor just asked for the entire ms. on disk, for the page proofs to be made from. The page proofs are the book as it will be: font, layout, size, etc., but not bound. My previous publisher had a typist re-key the whole thing from a final copyedited/line-edited ms. This made sense in the days when writers worked on typewriters -- there was no other way -- but it always resulted in new typos, that then had to be found. Since what's on the disk has already been copy-edited and my booboos found, it seems to me this is a much better idea. The typist will have to put the corrections from the three of us -- the copyeditor (red), my editor( black), and me (green) -- into the text, but anything that doesn't need to be corrected won't be changed. This limits the possible typos in the page proofs to ones that weren't caught by the copyeditor (very few, I'm sure) and new ones made by the typist in the corrections themselves. The reason this is important, besides the obvious one of fewer mistakes in the proofs, fewer in the final book, is that the page proofs go on to become the galleys and get read by reviewers who need a long lead time. So you want them to be as clean as possible.