Karen Judd's "Copyediting: A Practical Guide" is one of the few books on this topic. Any help in this area is appreciated, and Judd's guide is extremely handy.
Pros:
1. Her examples are excellent, unlike some other grammar and punctuation guides. Got a strange sentence construction? Her examples will cover it. Not sure if that appositive needs commas or not? Judd gives the correct answer.
2. Methodical. The book delineates the technical aspects of copyediting well.
3. Covers proofreading techniques and notations not found in style and grammar manuals.
4. The trade paper size of the book makes it far less cumbersome than others that include workbook training. Judd's workbook questions are just as easily managed in the smaller format.
5. The price is right.
Cons:
1. This is an enormous con: There are enough errors in the book to confuse readers. Judd sometimes lays out a rule, but then the example is wrong. (A few other reviewers noted this, too.) In a book on copyediting, you'd expect perfect copy! Needs a revision badly.
2. While the copyediting and proofreading marks are extensive, there are not enough variants listed. Some publishing houses require marks that aren't here. I'm no expert like Judd is, but I've seen far more mark variants in my copyediting experience than she covers.
3. This book is "plain brown wrapper" and could use a layout freshening. Almost too dull to look at.
4. Some of the proofing marks are not crisply printed. As a suggestion, this book would benefit greatly from a two-color printing process that makes the marks stand out from the text more effectively.
5. The paper used in the book's construction is cheap, possibly leading to durability issues over the long run. For a true reference work, this is a shame.
Could have been the best value out there in a copyediting reference, but there are enough cons to relegate it to being merely good. A new edition would be excellent, but one doesn't appear to be on the horizon any time soon. Too bad for us.