Inspired by the Seven Roads Gallery (which is no longer being updated), this Flickr group contains over 900 images of book trade labels, also known as bookseller labels.
As Dieter Zimmer’s online exhibit "Covering Lolita" shows, it started with a plain green jacket. [Note: Some links include images which may be NSFW.] [more inside]
Do You Know What I'm Going To Do Next Saturday? is a Flickr set of the pages from Helen Palmer Geisel's (Dr. Seuss's first wife) now out of print children's book that gained notoreity for its depiction of children doing fun & very dangerous things like joining the marines, playing with guns & fighting American Gladiator style.
Penguin Books is an all too brief Flickr Photoset of Penguin Book cover designs from decades past. For those interested, this book is highly recommended.