Here are some books that I've found interesting or helpful, or just entertaining all around. If you have any you would like for me to add, just reply to the post with the title and author, and I'll add it with a link to where it can be bought.
Divination:
1. The Book of Runes by Ralph H. Blum
2. How to Read Signs and Omens in Everyday Life by Sarvananda Bluestone, Ph.D.
3. Tarot: An easy-to-follow illustrated guide to the mysteries of the Tarot by Jonathan Dee
Paganism, Magic, Wicca, Witchcraft, etc.:
1. Earth Power: Techniques of Natural Magic by Scott Cunningham
2. Bud, Blossom, & Leaf: The Magical Herb Gardener's Handbook by Dorothy Morrison
3. Grimoire for the Green Witch: A Complete Book of Shadows by Ann Moura
New Age Phenomena:
1. Dreams and Healing: A Succinct and Lively Interpretation of Dreams by John A. Sanford
2. Magical Aromatherapy: The Power of Scent by Scott Cunningham
3. 1001 Natural Remedies by Laurel Vukovic
4. Animal Magick: The Art of Recognizing and Working with Familiars by DJ Conway
5. Earth Path: Grounding Your Spirit in the Rhythms of Nature by Starhawk
Paranormal/Ghost Hunting & Investigating:
1. A Ghosthunter's Guide to Haunted Landmarks, Parks, Churches, and Other Public Places by Arthur Myers - This book is a bit out of date, and it doesn't mention haunted places in every state (which is a bit disappointing), but it's an interesting read.
2. A Field Guide to Demons, Fairies, Fallen Angels, and Other Subversive Spirits by Carol K. Mack & Dinah Mack - I can say that I don't agree with much that's written in this book, but it is very interesting nonetheless.
Religious & Spiritual:
1. Secrets of Native American Herbal Remedies: A Comprehensive Guide to the Native American Tradition of Using Herbs and the Mind/Body/Spirit Connection for Improving Health and Well-Being by Anthony J. Cichoke
2. The Temple of Shamanic Witchcraft: Shadows, Spirits and the Healing Journey by Christopher Penczak
3. The World of Shamanism: New Views of an Ancient Tradition by Roger Walsh