If the Happy Homemaker's collection of vintage valentines isn't enough for you, Michele Catalano has more here. She calls them creepy, but some of them are kind of sweet, in a weird sort of early 20th century way. (Not the one with the electrocuted puppy, though. That's just horrible.) And they had anti-valentines back then, too. More here.
(Hat tip: Ace of Spades.)
In the same sweet Valentine's Day mood, Michele doesn't hold much hope for Cathy and Irving's future. (Not for the faint of heart or tender of ears.)