I counted every amazon link on every single question and answer page (5,427 pages) from the human relations category of Ask.MetaFilter. This spans more than five years worth of advice.
Personally, I trust this list to be the best books on the topic. That's because I believe in the power of hive minds, and I believe that MetaFilter is one of the best hive minds out there. I don't know why MetaFilter is so good. Perhaps it's because it costs $5 to join the community, or that it has a slight bias for librarians. All I know is that some book recommendations on there have changed my life.
And now I have a lot more reading to do.
-  | Feeling Good: The New Mood Therapy Revised and Updated
by David D. Burns |  |
 | The Five Love Languages: How to Express Heartfelt Commitment to Your Mate
by Gary Chapman | |
 | The Gift of Fear
by Gavin De Becker | |
 | How to Win Friends & Influence People
by Dale Carnegie | |
 | The Feeling Good Handbook
by David D. Burns | |
 | Difficult Conversations: How to Discuss what Matters Most
by Douglas Stone, Bruce Patton, Sheila Heen, Roger Fisher | |
 | You Just Don't Understand: Women and Men in Conversation
by Deborah Tannen | |
 | Learned Optimism: How to Change Your Mind and Your Life
by Martin E. P. Seligman | |
 | He's Just Not That Into You: The No-Excuses Truth to Understanding Guys
by Greg Behrendt, Liz Tuccillo | |
 | Passionate Marriage: Keeping Love and Intimacy Alive in Committed Relationships
by David Schnarch PhD | |
 | The Introvert Advantage: How to Thrive in an Extrovert World
by Marti Olsen Laney | |
 | Codependent No More: How to Stop Controlling Others and Start Caring for Yourself
by Melody Beattie | |
 | The Anxiety & Phobia Workbook, Fourth Edition
by Edmund J. Bourne | |
 | The Ethical Slut: A Guide to Infinite Sexual Possibilities
by Dossie Easton, Catherine A. Liszt | |
 | How to Talk So Kids Will Listen & Listen So Kids Will Talk
by Adele Faber, Elaine Mazlish | |
 | The Seven Principles for Making Marriage Work: A Practical Guide from the Country's Foremost Relationship Expert
by John M. Gottman, Nan Silver | |
 | Don't Shoot the Dog!: The New Art of Teaching and Training
by Karen Pryor | |
 | Getting the Love You Want: A Guide for Couples, 20th Anniversary Edition
by Harville Hendrix | |
 | How to Talk to Anyone: 92 Little Tricks for Big Success in Relationships
by Leil Lowndes | |
 | Stop Walking on Eggshells: Taking Your Life Back When Someone You Care About Has Borderline Personality Disorder
by Paul T. Mason, Randi Kreger | |
 | The Artist's Way: A Spiritual Path to Higher Creativity [10th Anniversary Edition]
by Julia Cameron | |
 | The Dance of Anger: A Woman's Guide to Changing the Patterns of Intimate Relationships
by Harriet Lerner | |
 | When Things Fall Apart: Heart Advice for Difficult Times
by Pema Chodron | |
 | Intimate Connections
by David D. Burns | |
 | Taking Charge of Your Fertility, 10th Anniversary Edition: The Definitive Guide to Natural Birth Control, Pregnancy Achievement, and Reproductive Health
by Toni Weschler | |
 | Emotional Intelligence: 10th Anniversary Edition; Why It Can Matter More Than IQ
by Daniel Goleman | |
 | Getting Things Done: The Art of Stress-Free Productivity
by David Allen | |
 | How to Be an Adult: A Handbook for Psychological and Spiritual Integration
by David Richo | |
 | Influence: The Psychology of Persuasion (Collins Business Essentials)
by Robert B. Cialdini | |
 | Man's Search for Meaning
by Viktor E. Frankl | |
 | Mind Over Mood: Change How You Feel by Changing the Way You Think
by Dennis Greenberger, Christine Padesky | |
 | Miss Manners' Guide to Excruciatingly Correct Behavior, Freshly Updated
by Judith Martin, Gloria Kamen | |
 | No More Mr. Nice Guy!
by Robert A. Glover | |
 | Party of One: The Loners' Manifesto
by Anneli Rufus | |
 | The Game: Penetrating the Secret Society of Pickup Artists
by Neil Strauss | |
 | The Power of Now: A Guide to Spiritual Enlightenment
by Eckhart Tolle | |
 | The War of Art: Break Through the Blocks and Win Your Inner Creative Battles
by Steven Pressfield | |
 | Toxic Parents: Overcoming Their Hurtful Legacy and Reclaiming Your Life
by Susan Forward, Craig Buck | |
 | Why Does He Do That?: Inside the Minds of Angry and Controlling Men
by Lundy Bancroft | |
 | Why Marriages Succeed or Fail: And How You Can Make Yours Last
by John Gottman | |
| A Guide to Rational Living by Albert Ellis, Robert A. Harper, Melvin Powers | |
| Asperger Syndrome and Long-Term Relationships by Ashley Stanford | |
| Blink: The Power of Thinking Without Thinking by Malcolm Gladwell | |
| Divorce Busting: A Step-by-Step Approach to Making Your Marriage Loving Again by Michele Weiner-Davis | |
| Emily Post's Etiquette, 17th Edition (Thumb Indexed) by Peggy Post | |
| Getting to Yes: Negotiating Agreement Without Giving In by Roger Fisher, William L. Ury, Bruce Patton | |
| Guide to Getting It On, 5th Edition by Paul Joannides | |
| He's Scared, She's Scared: Understanding the Hidden Fears That Sabotage Your Relationships by Steven Carter, Julia Sokol | |
| How to Stop Worrying and Start Living by Dale Carnegie | |
| If... (Questions For The Game of Life) by Evelyn McFarlane, James Saywell | |
| Mistakes Were Made (But Not by Me): Why We Justify Foolish Beliefs, Bad Decisions, and Hurtful Acts by Carol Tavris, Elliot Aronson | |
| Nice Girls Don't Get the Corner Office: 101 Unconscious Mistakes Women Make That Sabotage Their Careers by Lois P. Frankel | |
| Please Understand Me: Character and Temperament Types by David Keirsey, Marilyn Bates | |
| Queen Bees and Wannabes: Helping Your Daughter Survive Cliques, Gossip, Boyfriends, and Other Realities of Adolescence by Rosalind Wiseman | |
| Reviving Ophelia: Saving the Selves of Adolescent Girls by Mary Pipher, Ruth Ross | |
| Siblings Without Rivalry: How to Help Your Children Live Together So You Can Live Too by Adele Faber, Elaine Mazlish | |
| The 48 Laws of Power by Robert Greene | |
| The Art of Seduction by Robert Greene | |
| The Book of Questions by Gregory Stock | |
| The Dance of Intimacy by Harriet Lerner | |
| The Dangerous Book for Boys by Conn Iggulden, Hal Iggulden | |
| The Definitive Book of Body Language by Barbara Pease, Allan Pease | |
| The Drama of the Gifted Child: The Search for the True Self, Revised Edition by Alice Miller | |
| The Four Agreements: A Practical Guide to Personal Freedom, A Toltec Wisdom Book by Don Miguel Ruiz | |
| The Now Habit: A Strategic Program for Overcoming Procrastination and Enjoying Guilt-Free Play by Neil Fiore | |
| The Relationship Cure: A 5 Step Guide to Strengthening Your Marriage, Family, and Friendships by John Gottman | |
| The Shyness & Social Anxiety Workbook: Proven Techniques for Overcoming Your Fears by Martin M. Antony, Richard P. Swinson | |
| Too Good to Leave, Too Bad to Stay: A Step-by-Step Guide to Help You Decide Whether to Stay In or Get Out of Your Relationship by Mira Kirshenbaum | |
| Trauma and Recovery: The Aftermath of Violence--from Domestic Abuse to Political Terror by Judith Herman | |
| What To Do When Someone You Love Is Depressed : A Practical, Compassionate, and Helpful Guide by Mitch Golant Ph.D., Susan K. Golant | |
| When I Say No, I Feel Guilty by Manuel J. Smith | |
| Why People Believe Weird Things: Pseudoscience, Superstition, and Other Confusions of Our Time by Michael Shermer, Stephen Jay Gould | |
| Woman: An Intimate Geography by Natalie Angier | |