David Torkington's Site 
Catholic author, writer, journalist, retreat master and spiritual director specializing in writing and lecturing about Christian Mystical Theology and Prayer. Includes his writings and lectures and audio tapes about Christian Prayer.
http://homepage.virgin.net/david.torkington/Inner Explorations 
Where Christian mysticism meets Eastern religions, Jungian psychology and a new sense of the earth.
http://www.innerexplorations.com/
Gender in Medieval Christian Mysticism 
Syllabus for a Religion course taught at Boston University. Includes links to online materials.
http://people.bu.edu/dklepper/RN413/
Catholic Encyclopedia: Mysticism 
Mysticism as direct union of the human soul with the Divinity primarily from a Catholic perspective, but does mention other mystical traditions.
http://www.newadvent.org/cathen/10663b.htm
Mystics in Love 
Overview of the concepts of Christian mysticism, and introductions to a handful of Christian mystics.
http://www.gloriana.nu/mystic.html
Catholic Encyclopedia: Mystical Theology 
Mysticism and mystical prayer or contemplation considered from a Catholic perspective, along with a bibliography of famous Christian mystics.
http://www.newadvent.org/cathen/14621a.htm
Receive a daily excerpt from The Cloud of Unknowing 
The Cloud of Unknowing is a first expression in English of the spiritual wisdom as experienced by Christians during the first 1000 years after Christ.
http://groups.yahoo.com/group/cloud_of_unknowing/
The Boke of Margery Kempe and the Shewings of Julian of Norwich 
Notes from a course on English literature from Beowulf to Dryden, at Goucher College.
http://faculty.goucher.edu/eng211/Margery%20Kempe%20and%20Julian%20of%20Norwich.html