Here's a time line of the things that I've investigated -
*New Age (Shirley MacLaine and such)
*Witchcraft (First Book - The Spiral Dance, the one published in 1987)
*Wicca (First Book - Wicca for the Solitary Practitioner, when it was first published
*NeoPaganism
*Buddhism
*Pantheism
*Agnosticism
*Atheism
*Celtic Reconstructionsim
*Reclaiming Witchcraft