My favorite books on the craft of writing:

* Titles in red are those I've found most helpful for the way I write (as a seat-of-the-pants plotter).

A Novel Idea: Best advice on writing Inspirational Fiction, ChiLibris, Tyndale House 
Getting Into Character, Brandilyn Collins, John Wiley & Sons
Plot vs. Character, Jeff Gerke, Writer's Digest Books
GMC: Goal, Motivation and Conflict, Debra Dixon, Gryphon Books 
On Writing Well, William Zinsser, Harper & Row
Polishing the PUGS (Punctuation, Usage, Grammar, and Spelling), Kathy Ide, UpWrite Books
Plot & Structure, James Scott Bell, Writer’s Digest Books
Quit Your Day Job, Jim Denney, Quill Driver Books (To order, call 1-800-497-4909)
Revision & Self-Editing, James Scott Bell, Writer's Digest Books
Self-Editing for Fiction Writers, Renni Browne & Dave King, HarperCollins
Stein on Writing, Sol Stein, St. Martin’s Press
Strunk & White’s The Elements of Style, Longman Publisher
The Christian Imagination, Leland Ryken, Shaw Books
The Christian Writer’s Market Guide, Sally E. Stuart, Shaw Books
The Complete Idiot's Guide to Writing Christian Fiction, Ron Benrey, Alpha
The Creative Call, Janice Elsheimer, Shaw Books

The Heart of the Artist, Rory Noland, Zondervan
The Writer’s Journey, Christopher Vogler, Michael Wiese Productions
The Writer’s Market, Writer’s Digest Books
Writing the Breakout Novel, Donald Maass, Writer's Digest Books
Writing the Christian Romance, Gail Gaymer Martin, Writer's Digest Books