The Catalogue of Digitized Medieval Manuscripts offers a simple and straightforward means to discover medieval manuscripts available on the web. Very much a work in progress, the database will initially provide links to hundreds of manuscripts, which we expect quickly to grow to thousands. Basic information about the manuscripts is fully searchable, and users can also browse through the complete contents of the database. As the project develops, a richer body of information for each manuscript, and the texts in these codices, will be provided, where available.
Thanks to Ancient History Ramblings for the heads up.