The first four items are resources I have suggested as advance reading for a workshop I'm facilitating at Friends General Conference Gathering this summer.
Faith and Practice
I highly recommend Faith and Practice. This is a "book of discipline" that a number of yearly meetings publish, and it is a good source of information and shared wisdom about Friends' testimonies, worship, practices, and history.
The version with which I am most familiar is Philadelphia Yearly Meeting's, which is available on-line here, or in hard copy through Quakerbooks of Friends General Conference.
I can also recommend Britain Yearly Meeting's Faith and Practice, available on-line here, or in hard copy (you guessed it) from Quakerbooks.
For a list of Faith and Practice books of other yearly meetings, click here.
If there is a Quaker library in your area -- at a college or a local monthly or yearly meeting -- you will be able to borrow a copy.
Starhawk's book The Spiral Dance: the Rebirth of the Ancient Religion of the Great Goddess remains an excellent introduction to Paganism, particularly Witchcraft, as well as a good resource for experienced Witches looking to deepen their spiritual practice. This is available in hard copy only, although a large excerpt is available on-line here. Your local library may have it, or you might decide to buy it. Rather than buying from a mega-chain, please buy from an independent bookstore, either on-line or in person. BookSense is a good resource for independent bookstores. And one of my favorite independent bookstores, Quakerbooks (of course!) can order it for you as well.
The Spiral Dance
"Christians in My Meeting Made Me Pagan"This is Friend Daniel Hall's essay/posting to the QuakerPagan YahooGroup "about that conversion experience." It's available on-line here.
"The Syncretic Pagan"This is Friend Laura Salmonstone's essay in the Witchvox Adult Pagan Essay Series about her spiritual journey and her spiritual life. It's available on-line here.
Some additional web-based resources:Covenant of the Goddess
The Pagan Pride Project
QuakerFinder.org (primarily, but not exclusively, FGC)
I hope some of these resources are helpful for folks who are planning to come to our Gathering, or who are simply curious. Happy reading!