"for the purpose of appreciation and categorization"
Please visit The Book Cover Archive if you're an amateur book freak and wannabe-librarian like me who like to talk about things like type and bindings. Their tag line (the post title) says it all. The website also handily sorts by publisher, designer, author, author, illustrator etc, so it makes for a truly educational experience. Big thanks to Rachel of Black Eiffel for pointing it out!
Image captured from The Book Cover Archive