This isn't actually a forgotten book by any means, but some of the stories and their writers are forgotten, if anyone knew them in the first place.
I reviewed some of the stories earlier here, but now that I've finally gotten hold of an actual, physical copy, I can't but say: "Vow! This does look cool!" The book is hefty, and ripe with old illustrations and covers and ads from the sleazy men's adventures mags from the fifties, sixties and seventies. And there's lots of information about the authors, which is at times more important and more interesting than the actual stories.
I've had my hands full of other projects (for example, I just e-mailed my werewolf anthology to the publisher just five minutes ago), so I haven't had time to dip into the book again. But I mean to.
More Forgotten Books here.