The Chronicle of Higher Ed has a blog post highlighting the Catalogue of Digitized Medieval Manuscripts, an online database that links to digitized materials in various collections.
While many libraries and institutions are digitizing parts of their collections, it’s not always easy to find material in a specific subject area. These “aggregator” sites may become more common as scholars with common interests share links to materials.
Students in a class could put together something like this as part of activities centering around research in a course, using social bookmarking tools like Google Reader or delicious.