The Walters Art Museum in Baltimore, Maryland, like many institutions with important manuscripts, is digitizing their collection; a Preservation and Access grant from the NEH is supporting the creation of images for their Byzantine, Armenian, and Ethiopian holdings.  The Walters Art Museum’s approach, however, is multi-faceted: one can flip through “digital surrogates” of select manuscripts, especially in the Islamic collection, including this copy of the Shahname; or download digital images of others, such as this Syriac Galen, on a different site.  Most innovative, perhaps, is their creation of a Flickr stream with images from their archiving project, which may indeed be an effective way to have these manuscripts reach a broader audience. Here selections from a number of illuminated manuscripts are available:

http://www.flickr.com/photos/medmss/sets/

I will devote a separate entry to the Archimedes Palimpsest, which has its own site.