What is an Illuminated Manuscript?
These links can help explain:

• The British Library (as ever excellent) offers this overview.
• The Catholic Encyclopedia, New Advent, offers this origin of the illuminated manuscript.
  

Christian Text Libraries:

• The Hill Museum and Manuscript Library contains many digitized, searchable works.  Also contains illuminated texts.

• This wonderful, three page 'Links Library' of Early Christian Writers comes through the Diocese of Johannesburg, South Africa.  Links to everywhere, including many primary texts. Homepage, http://www.catholic-jhb.org.za

• The Christian Classics Ethereal Library contains many, many early Christian texts including the Ante-Nicene, Nicene, and Post-Nicene Volumes, and so much more.  This is an amazing resource, edited by Roger Pearse.

• Another comprehensive, early Christian library is Peter Kirby's Early Christian Writings.  This site offers, among many other texts, the Didache, and the Shepherd of Hermas.
  

• Glenn Gunhouse offers this fabulous resource through the the-orb.net:  a Parallel Latin/English Psalter, where the text, in Latin and English, appears side by side.

• Another site which offers an English-Latin parallel translation of the bible is http://www.latinvulgate.com/ where the Latin Vulgate Bible, the Douay-Rheims Bible, and King James English Version are available side by side.
  

Illuminated Manuscript Libraries:

• Medieval Illuminated Manuscripts through the 'Medieval Illuminated Manuscripts' from the Koninklijke Bibliotheek, or National Library of the Netherlands, and the Museum Meermanno-Westreenianum.

• The J. Paul Getty Museum's Exhibitions, especially their Explore Art link, offers many digitized, searchable collections, including the Stammheim Missal and medieval calendars.  Their Digitized Library Collections also include historic photographs of Mexico and images of tapestries. Homepage: http://www.getty.edu
  

• The British Library's 'Collect Britain' exhibitions boasts over 3000 digitized images from their Illuminated Manuscript Collections, including the Lindisfarne Gospels, the The Guthlac Roll, and many more.  Collect Britain homepage, http://www.collectbritain.co.uk/  British Library Homepage, http://www.bl.uk/ 

• Though these are not illuminated manuscripts, the British Library's collection of Early Photographically Illustrated Books online are worth mentioning here.  These books were among the first to use photographs as illustrations. 
  

• Le roi des manuscrits enlumines, listed here as Les Très Riches Heures du Duc de Berry ,  through http://www.christusrex.org/.
  

• Leaves of Gold Gallery. "Treasures of Manuscript Illumination from Philadelphia Collections."  From the Philadelphia Museum of Art, the University of Pennsylvania, and the Philadelphia Consortium of Special Collections Libraries.

• The Bodleian Library, though the University of Oxford contains manuscripts from a number of colleges and universities.  Also check the University of Oxford's image page, where many images are available at a high resolution, http://image.ox.ac.uk/

• The French National Library (La Bibliothèque nationale de France) has extensive collections of illustrated manuscripts through to the victorian, and even modern period, from their Lumieres pages.  French National Library homepage, http://www.bnf.fr/

• The Aberdeen Bestiary through the University of Aberdeen.  Another great site.
  

• Terrific Manuscript Links can be found though the Labyrinth, http://labyrinth.georgetown.edu/
  

Digitized Books & Literary Texts:

• No list of text libraries can be complete without mention of the-orb.net.  This extensive database of primary texts throughout history is an amazing cultural resource.  The Orb Reference Shelf will get you just about anywhere you ever wanted to go, including a link to The Internet Medieval Sourcebook, and the Labyrinth.

• ibiblio digital archive, formerly Sunsite, comes to the web through the University of North Carolina, Chapel Hill.  The site seeks to provide free and open resources, a "collections of collections" on the Internet, [...] including software, music, literature, art, history, science, politics, and cultural studies."

• Project Guttenburg offers 18,000 books online, with more titles added continuously.  (Proofreaders needed.)

• The University of Pennsylvania offers this, 25,000 title, Online Books Page.

• And, of course, the one and only--one of the first!--Bartleby.com "Great Books Online."
  

• Octavo.com is also worth a peek.  They also offer editions for sale.
  

• Matthew Steggle's Early Modern Literary Studies page has links to many literary works, including those of Edmund Spencer, William Shakespeare, Pliny, and Rene Descarte.  He includes many links to the University of Toronto's Representative Poetry Online, pages, which are also a terrific resource.

• I liked this little site.  Not a mega collection, I Remain focuses on digitizing letters and the written miscellany of daily life.  A wonderful idea, and a really interesting site though Lehigh University in Pennsylvania.

• How about this!  The Booke of the Courtyer (The Book of the Courtier), a book to instruct would be courtiers on proper court behavior by Baldessar Castilio, translated to English by Sir Thomas Hoby.  This book is available on the web through the University of Oregon's Renascence Editions, which focuses on English texts from 1477 to 1799.
  

• The Digital Bookfinder offers itself as a hub to deliver free material to users.  You have to log in to use it, though.  Ick.
  

Some E-Bookstores:

• Alibris

• Biblio

• Amazon.ca (Canada), Amazon.com (USA), Amazon.co.uk (England).
  

• Abebooks

• Chapitre.com  (France)

• BookFinder.com (For book searches)
  

Go to historyfish.net