Are looking for info on the many varied paths of paganism? Or one specific path? Wicca is probably the most well known, and it often seems that every pagan book is about wicca, but there are so many paths.
Pagan Pathways is pretty good and covers Wicca, Druidry, Heathenism, and some others I can't remember off the top of my head.
If you are looking for a good primer on Goddess spirituality the I really like The Spiral Dance by Starhawk, also wrote Circle Round, which is a wonderful book geared twords sharing the path with children. Also Witch Crafting by Phylliss Curott is great if you are looking for a book on Wicca.