Since I've been asked by several members, I've decided to post them here (the ones I remember anyway). Some of the books are on the biz, some on writing in general, but I think the top 25 are essential reading.
(Edited by David Negrin)
1 Story - Robert McKee
2 Adventures in the Screen Trade - William Goldman
3 Which Lie Did I Tell - William Goldman
4 Stein on Writing - Sol Stein
5 Save the Cat - Blake Snyder
6 Screenwriting: The Art, Craft and Business - Richard Walter
7 Screenwriting Tricks of the Trade - William Froug
8 The First Five Pages - Noah Lukeman
9 The Whole Picture - Richard Walter
10 Art of Dramatic Writing - Lajos Egri
11 On Writing Well - William Zinsser
12 Art of Creative Writing - Lajos Egri
13 Lew Hunter's Screenwriting 434 - Lew Hunter
14 When the Shooting Stops, the Cuttting Begins - Ralph Rosenblum
15 How to Grow a Novel - Sol Stein
16 The Art of Fiction - John Gardner
17 How Not to Write a Screenplay - Denny Flinn
18 Solutions for Novelists - Sol Stein
19 The Secrets of Action Screenwriting - William Martell
20 500 Ways to Beat the Hollywood Script Reader - Jennifer Lerch
21 Screenplay - Syd Field
22 Crafty Screeenwriting - Alex Epstein
23 The Screenwriter's Bible - David Trottier
24 The Forest for the Trees - Betsey Lerner
25 Bird by Bird - Anne Lamott26 Writing Down the Bones - Natalie Goldberg
27 The Screenwriter's Problem Solver - Syd Field
28 Elements of Style - Strunk and White
29 Aristotle's Poetics - Francis Fergusson
30 The Weekend Novelist - Robert Ray
31 The Writer's Journey - Christopher Volger
32 Master Class in Fiction Writing - Adam Sexton
33 The First Time I Got Paid for it - William Goldman
34 The Power of the Actor - Ivana Chubbuck
35 Line by Line - Claire Cook
36 What Are You Laughing At - Brad Schreiber
37 The Craft of the Screenwriter - John Brady
38 Making a Good Script Great - Linda Seeger
39 Advanced Screenwriting - Linda Seger
40 How to Build a Great Screenplay - David Howard
41 Creating Characters; Let them Whisper Their Secrets - Marisa D'Vrai
42 Breakfast with Sharks - Michael Lent
43 Making a Good Writer Great - Linda Seger
44 The Screenwriter's Survival Guide - Max Adams
45 How to Write a Selling Screenplay - Christopher Keane
46 The Screenwriter's Workbook - Syd Field
47 On Writing - Stephen King
48 I Liked It, Didn't Love It - Rona Edwards
49 Creating Unforgettable Characters - Linda Seger
50 Zen and the Art of Screenwriting - William Froug
51 Selling a Screenplay - Syd Field
52 Top Secrets: Screenwriting - Jurgen Wolff
53 The Plot Thickens - Noah Lukeman
54 The Literary Life and Other Curiosities - Robert Hendrickson
55 Writing Mysteries - Mystery Writers of America
56 Understanding Comics - Scott McCloud
57 Hot Property - Chris Keane
58 Hollywood 101: The Film Industry - Frederick Levy
59 The Screenwriter Looks at the Screenwriter - William Froug
60 Rebel Without a Crew - Robert Rodriguez
61 Writing Dialogue - Tom chiarella
62 Secrets of Screenplay Structure - Linda Cowgill
63 The 101 Habits of Highly Successful Screenwriters - Karl Iglesias
64 The Mailroom - David Rensin
65 Screenplay: Writing the Picture - Robin Russin
66 The New Screenwriter Looks at the New Screenwriter - William Froug
67 The War of Art - Steven Pressfield
68 So You Want to be a Screenwriter - Sara Caldwell
69 Writing a Great Movie - Jeff Kitchen
70 The Script Selling Game - Kathie Yoneda
71 The Hollywood Rules - anonnymous
72 Woody Allen on Woody Allen - Stig Bjorkman
73 Making Movies - Sidney Lumet
74 Hollywood Animal - Joe Eszterhas
75 Cinematic Storytelling - Jennifer Sijill
76 Writer's Guide to Selling Your Screenplay - Cynthia Whitcomb
77 Psychology for Screenwriters - William Indick
78 Dangerous Company - Peter Bart
79 The Visual Story - Bruce Block
80 You'll Never Eat Lunch in this Town Again - Julia Phillips
81 Film Directing Shot by Shot - Steven Katz
82 How to be Funny - Jon Macks
83 The Big Picture - William Goldman
84 5001 Nights at the Movies - Paulilne Kael
85 They Can Kill You But They Can't Eat You - Dawn Steel
86 The 5 C's of Cinematography - Joseph Mascelli
87 How to Write a Movie in 21 Days - Viki King
88 What Just Happened - Art Linson
89 The Devil's Candy: The Bonfire of the Vanities - Julie Salomon
90 The Screenwriter Within - D. B. Gilles
91 Screenwriting from the Soul - Richard Krevolin
92 The Movie Book Business - Jason Squire
93 The Comic Toolbox - John Vorhaus
94 What Makes Sammy Run - Budd Schulberg
95 Screenwriting: The Sequence Approach - Paul Gulino
96 Power Screenwriting - Michael Chase Walker
97 H