"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.)
Kindle seems to be on the way to marginalizing books. In memoriam, 19th and 20th century Bookplates from the Pratt Libraries Bookplate Collection.
EXLIBRIS MUSEUM. We've done ex-libris bookplates before, but trust me, this site far surpasses anything you've ever seen. Just go to the Gallery and click on any of the names. Vereshchagin, for instance. Or Karol Felix. Or... hell, just dive in, you can't go wrong. Warning: many bookplates contain female nudes. (Via dirty.ru; thanks, misteraitch!)
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.
A Gallery of Bookplates. I always think it's a wonderful surprise when I'm antique bookshopping and I happen across some beautiful ex-libris. Many more links found via Joy Olivia on the Graphic Design blog Speak Up.