After reading several introductory books on wicca and witchcraft, it's hard to find something new that will actually add to your understanding of what if means to follow this spiritual path. An Ye Harm None offers practical information for the modern pagan to help them make ethical choices in day-to-day life.
While any beginner of how-to book on wicca can set you on the path, An Ye Harm None really examines what it means to be on that path in our modern world. The book doesn't preach. For the most part, it simply lays out the facts and provides a guide for making the right decision.
The book is ideal for a serious student (or even teacher) of the pagan path. It addresses issues such as having or not having children, and raising children in a way that fits with pagan beliefs. These are hardly issues of interest to someone who is just curious about witchcraft.
Most of the issues are of a practical nature: money, environmentalism, relationships, health, charity, etc... But as the title indicates "magical morality" is also covered. Anyone who has read any serious books on Wicca has read that you should not use magic to influence the free will of another person. This book does not dwell on this topic very long, but it does expand on this point, as well as introduce a few other issues relevant to solitary and group rituals and magics.
It is also worth noting that the authors are Canadian and have tried to offer a balanced perspective of North America as a whole (offering parallel examples for both the US and Canada when appropriate) as well as including relevant information from other areas of the world. Often conditions in European countries are referenced to as a contrast to North American conditions.
Ever since I became Wiccan, I have been looking for a book that would not only teach the spells (I never really was interested in them, just the religion itself), but would really show you how to live a life that helps other people and the world at large. This book has many useful tips that are easy to implement. After reading this, I can proudly call myself Wiccan. Also, if you are new to the religion, buy Living Wicca by Scott Cunningham. It is a Wicca 101 book, but one of the best out there.