Many of us know there's not necessarily such a thing as "correct" written English, and the same can be said for pronunciation. This book explores the many accents of English speakers, where they came from, and how we feel about them.
McGraw-Hill's Proofreading Handbook 2nd Edition
Cover to Cover: What First-Time Authors Need to Know about Editing
Developmental Editing: A Handbook for Freelancers, Authors, and Publishers (Chicago Guides to Writing, Editing, and Publishing)