Another great web site! I'm not really in genealogy as the ancient Bedes live in well deserved obscurity but for one notable exception, but this site is a gold mine for doing medieval research in England. All the common sources of official data are covered, both the manuscripts and printed sources, not to mention links to other useful places including on-line palaeography courses. The site: Medieval Genealogy.

Some websites with useful information on finding and uses history sources:

How to find those elusive papal bulls

An index to the Rolls Series

Medieval philosophy from Paul Vincent Spade