I don't know if anyone has mentioned these before, but I've come across two sites on medieval history that may be very valuable.
(1) The first in is French (but can be translated if necessary) and deals with medieval Normandy: a journal called Tabularia.
http://www.unicaen.fr/mrsh/craham/revue/tabularia/index.html
Here is the description in English: Tabularia. Sources écrites de la Normandie médiévale (Tabularia. Written Sources of Medieval Normandy) is an online journal which is freely accessible on the CRAHM website hosted by the University of Caen network.
Tabularia aims at studying the medieval written sources of Normandy. It was launched in order to give instant access to available information on the topic. This journal also aims at fostering a debate around the proposed dossiers by allowing exchanges to take place between readers and authors. Ultimately, it also devotes much space to the circulation and publication of written documentary sources, whether published or unpublished. The scientific validity of the information content is guaranteed by the presence of an editorial board and by cross-reading of submitted contributions.
(2) The other site will be of great interest to Geni researchers, The Internet Medieval Sourcebook from the Fordham University Center for Medieval Studies.
http://www.fordham.edu/halsall/sbook1n.html
It's been around since 1996 and is an amazing compendium of information on all things medieval, including
Saints' Lives
Law Texts
Maps
Studying History
End of Rome
Byzantium
Islam
Roman Church
Early Germans
Celtic World
Carolingians
10 C Collapse
Economic Life
Crusades
Empire & Papacy
France
England
Celtic States
Iberia
Italy
Intellectual Life
Medieval Church
Jewish Life
Social History
Sex & Gender
States & Society
Renaissance
Reformation
Exploration
Happy exploring!