A link to the Princeton University Library digitized special collection Hand Bookbindings: Plain and Simple was featured as the Library Link of the Day on July 23, 2005. The digitized exhibit consists of 211 items in “26 groups showing genres and structures.” Some of the groupings are Italian bindings, German bindings, endleaves, gold tooling, and early codex and coptic sewing. Each grouping has several examples. When you click on the image of an item, you will get page with a larger image and a manification square. Select the size of the magnification square and move it over the parts of the image that you want made larger.

LibrarianInBlack blogged an announcement on October 10, 2004.

Further research
ALA ACRL Book arts on the Web [C&RL News, April 2004 Vol. 65, No. 4]
Canadian Bookbinders and Book Artists Guild CBBAG online gallery.
LLI Bookbinding search.
Princeton University Rare Books and Special Collections: online exhibits.