"Living Wicca" by Scott Cunningham.
Geared to the solitary practitioner. Helps one develop one's own way of worship, etc. Very good if you lack a form of structure. A bit "love and light" for the tastes of many, but I like Cunningham. He writes as one person to another person. You find many books where the author is clearly in Teacher mode, but Cunningham's style is fairly humble.
"The Magick Toolbox" by Carl Neal.
I cannot recommend this one enough. Brilliant and especially helpful for the beginning Wiccan or Wicca-based Pagan. Goes through many tools, including a couple you may be less familiar with. Includes little ritual ideas for charging and consecrating the object, and examples of how to make your own or modify a tool to make it more yours. While many of the tools are Wiccan, as Wicca is rather fond of its tools, Neal gives non-Wiccan interpretations of some of them as well as Wiccan interpretations, and makes the effort not to be path-specific. Seriously, give it a read.
"Exploring Shamanism" by Hillary S. Webb
Fantastic book. It manages, somehow, to be both geared to the beginner AND particularly in-depth. It was inspiring. It changed my life and my path significantly. Webb includes and extensive reading list and often quotes, which can get slightly irritating, but on the whole is enlightening. If you're even slightly interested in shamanism, give it a read.
I'll totally be back with more wink