For people truly wishing to be informed about the subject, this is a useful although obviously not complete list of relevant non-fiction litterature dealing with various aspects of BDSM, of interest to people of all roles.
A to Z of BDSM
How to Be Kinky A Beginner's Guide to BDSM
Screw the Roses Send Me the Thorns the Romance and Sexual Sorcery of Sadomasochism
BDSM Basics for Beginners A Guide for Dominants and Submissives Starting to Explore the Lifestyle
Domination & Submission The BDSM Relationship Handbook
Consensual Sadomasochism How to talk about it & how to do it safely
La Laisse A Common Sense Approach to Dominance and Submission
Sexual Masochism The Sexual Pleasure of Pain
The Many Shades of BDSM
Two Knotty Boys Showing You the Ropes A Step-by-Step Illustrated Guide for Tying Sensual and Decorative Rope Bondage
Two Knotty Boys Back on the Ropes
The Ultimate Guide to Kink BDSM Roleplay and the Erotic Edge
The Lesbian S/M Safety Manual
The Curious Human Phenomenon An exploration of some uncommonly explored aspects of BDSM
On the Safe Edge A Manual for SM Play
Master/slave relations: Handbook of Theory and Practice
Learning The Ropes A Basic Guide To Safe And Fun S/M Lovemaking
Jay Wiseman's Erotic Bondage Handbook
Different Loving The World Of Sexual Dominance & Submission
50 Ways To Play BDSM For Nice People
Shibari The Art of Japanese Bondage
The Beauty of Kinbaku
Bondage Basics
Shibari You Can Use Japanese Rope Bondage and Erotic Macrame
More Shibari You Can Use Passionate Rope Bondage and Intimate Connection
Essence of Shibari Kinbaku and Japanese Rope Bondage
SM 101 A Realistic Introduction
Conscious Kink For Couples
Extreme Space The Domination & Submission Handbook
BDSM The Naked Truth
50 Shades of Kink An Introduction to BDSM
BDSM101
Das Bondage-Handbuch (that's in German)
The Better Built Bondage Book
Complete Shibari vol.1 Land
Complete Shibari vol.2 Sky