I recently finished reading Taoism: An Essential Guideby Eva Wong, which is a terrific overview of Taoism. I appreciated the fact that the author tried to explain all the various branches of Taoism, to cover their core tenets, and to give some essential philosophy or practices. I especially liked how at the end of each chapter she offered additional resources if you were interested in researching that area in greater detail.
After giving a history of Taoism, with its roots in shamanic practices in China, Wong then covers the various systems of Taoism. Included in this section are chapters on magical Taoism, divinational Taoism, ceremonial Taoism, internal-alchemical Taoism, and action and karma Taoism. Really interesting stuff! Lastly, she presents an overview of some Taoist practices, such as some meditation techniques, how Taoists cultivate and strengthen the body, and certain rites and ceremonies.
I read one reader's review, a complaint really, that the book doesn't go into enough detail. I think the author did a fine job of presenting the essences of each practice. If she had gone into a lot of detail, I don't think I could have lifted the resulted book! For an overview, this book works well. Recommended.