Major Medieval Archives and Lists of Links Guide to Archaeology on the Internet
An article in the Athena Review. This includes a great many links to sites relevant to Medieval archaeology and history.

The Online Reference Book for Medieval Studies

The Online Medieval Sourcebook, a very well organized list of links.

A Library of online texts and translations

An Encyclopedia of scholarly articles on the Middle Ages.

SUL Medieval Pages at Stanford University
This site has a list of links and a listing of library collections. It also has a large bibliography of translations of Medieval texts. At the moment, access to all but a few of the on-line texts are restricted to people affiliated with Stanford University.

Other Sites with Information on the Middle Ages

Exemplaria: A Journal of Theory in Medieval and Renaissance Studies
The WebMuseum by Mark Harden
Women in the Later Middle Ages & Renaissance