Not sure what will end up on this thread - please post any impressive libraries you see, or especially what you own, as that would interest me - but I saw the picture below on a book traders website and thought I'd post it somewhere here, because, well... wow. This is a complete set of Gnome Press HB first editions from 1948 to 1961. It is apparently a personal library someone spent years gathering together. I won't point any titles out specifically, as it's fun to go though it, but there must be well over $100k worth of books here! I would probably trade a limb for this collection...