The Hill Museum and Manuscript Library (HMML) has photographed more than 250,000 manuscripts around the world, and has done significant work in digitizing early Christian written artefacts from endangered countries. The website information on the library collection as well as images, music and links to related resources. See also their digital project, vHMML.
NAPS - The North American Patristics Society
Dedicated to the Study of the History & Theology of Early Christianity