A while back Alec Soth wrote and interesting piece about photography and book covers
Then today I noticed a post by Mary Virgina Swanson about "Covering Photography" a sort of database and archive of photographers and book covers. You can search by photographer, author, publisher etc. It's surprisingly interesting. Especially intriguing is what photographer is matched with what book - sometime rather incongruously so. And how many of my favourite photographers find their way onto the covers of books of poetry...
(oh, and Alec mentioned Covering Photographs in his original post, but I never clicked on the link...)
POSTSCRIPT - Drew commented on this cover for the Iliad - cool...: