BOOKS
On Writing by Stephen King
The Elements of Style, by William Strunk, Jr. and E. B. White.
Writing Down the Bones: Freeing the Writer Within, by Natalie Goldberg
The Business of Being a Writer by Jane Friedman
The War of Art: Break Through the Blocks & Win Your Inner Creative Battles, by Steven Pressfield.
Stein on Writing by Sol Stein
Writing the Breakout Novel by Donald Maass
The Writers Journey: Mythic Structure for Writers, 3rd Edition by Christopher Vogler and Michele Montez
A New Guide to Better Writing by Ph.D. Rudolf Franz Flesch and A. H. Lass
Writing Fiction: The Practical Guide from New York's Acclaimed Creative Writing School by Gotham Writers' Workshop
Writing Movies: The Practical Guide to Creating Stellar Screenplays by Gotham Writers' Workshop
The Hero with a Thousand Faces (Bollingen Series, No. 17) by Joseph Campbell
The Artist’s Way by Julia Cameron
The Mother Tongue by Bill Bryson
Zen in the Art of Writing by Ray Bradbury
Writing Well by William Zinsser
Writing Tools: 50 Essential Strategies for Every Writer by Roy Peter Clark
Bird By Bird: Some Instructions on the Writing Life by Anne Lamott
The Writing Life by Annie Dillard
The Art of Fiction: Notes on Craft for Young Writersby John Gardner
Wired For Story by Lisa Cron
Save the Cat by Blake Snyder (for screenwriting but has excellent information that applies to writing a manuscript as well)
100 Ways to Improve Your Writing by Gary Provost (lots of great writing tips. You have probably seen the popular tip about varying your sentence length - this is page 58 of Gary's book).
The Emotion Thesaurus by Angela Ackerman & Becca Puglisi
(All of the Thesauruses by Angela and Becca are excellent resources for writers)
The Emotional Craft of Fiction by Donald Maas
Understanding Show Don't Tell (And Really Getting It) by Janice Hardy
Fight Write by Carla Hoch: How to Write Believable Fight Scenes
ADDITIONAL READING MATERIAL
Poets and Writers Magazine with articles on writing and lists of contests, schools, and residencies.
New York Times Book Review. Need I say more?