It’s been awhile since the last one of these, eh? A lot of this is from SHARP-L, but a couple come from other sources that I (sadly) forgot to note when I filed them.

Bembo’s Zoo, a very stylish abecedarium that plays with typography.
A Harvard Survey of Publishing: From Text to Hypertext
The Munich copy of the Gutenberg Bible has been digitized. Bettina Wagner mentioned on the SHARP-L that this copy is one of only two which contain the table of rubrics, a printed list of headlines which served as a guide to the rubricator.
Book History Online, The International Bibliography of the History of the Printed Book and Libraries.
Bibliopolis, which is devoted to the history of the printed book in the Netherlands.

And finally, two essays to look into re genre and/or authorship:
Hochman, Barbara. "Uncle Tom's Cabin in the National Era: An Essay in Generic Norms and the Contexts of Reading." Book History 7 (2004), 143-170.
Satelmajer, Ingrid. "Dickinson as Child's Fare: The Author Served up in St. Nicholas." Book History 5 (2002), 105-142.