Here is a fairly comprehensive article on the History of Witchcraft, with many more online references, by the folks at HalloweenCostumes.com.
Maryland Ghost and Spirit Association - (Frederick County) http://www.marylandghosts.com/locations/frederick.shtml
This site contains recorded hauntings in the state of Maryland, public scrapbook with photos, ghost hunting tips and more.
Wiccan Together - Appears to be an online commumity for Wiccans and Pagans
Maryland Ghost and Spirit Association Message Forums - http://marylandghosts.community.everyone.net/community/scripts/directory.pl
Intensities: The Journal of Cult Media - http://www.cult-media.com/issue3/Abad.htm
"Spiritual Warefare: Post feminism and the Cultural Politics of the Blair Witch Craze" by Linda C. Bradley.
Gapland: A Ghost on the Trail - http://www.patc.net/history/archive/gapghost.html
"The following is an historic reprint from the April 1934 Edition of the Potomac Appalachian Trail Club Bulletin."
Witches Voice - http://www.witchvox.com/
NeoPagan News and Networking (online since 1997).