Here are some subscribed newsgroups that may be useful for the exchange of ideas and information about medieval-era history and genealogy.
The title is somewhat of a misnomer, as there is no "project" per se connected with the list. Searchable archives database.
Gen-Medieval Mailing List Archives
Useful tool for locating citations to secondary works. Searchable database. Warning: flame wars are a regular occurence on this list.
A moderated list, promising to maintain a civil dialogue on the subject of medieval genealogy.