"The Extraordinary World of Ex Libris Art." A collection of bookplates of the famous and the obscure, from Charles Dickens to Greta Garbo to Jack Dempsey. (Via VSL.)
Heraldic Bookplates While everybody knows about book collecting, bookplate (ex libris) collecting has a somewhat lower profile. But those seemingly utilitarian bookplates can be a source of endless fascination, whether for the aesthetics or the owner association. For images, see Early American Fiction (U. of Virginia), Estonian Bookplates, the Murray Collection (U. of British Columbia), and the Bookplate Directory (Notre Dame). Joseph Manzano has proposed ex Webis (some female nudes, possibly NSFW). For more information, visit the American Society of Bookplate Collectors and Designers, which among other things links to a site devoted to Beethoven bookplates (warning: prepare to hear the Piano Sonata No. 21 in C Major). Or go ahead and read some articles.