"Never ask a guest if she'd like more wine, even if it's her fifth glass. It's better to say 'Would you like some wine,' as if you're filling her glass for the very first time."
Good tip, right? Also, this is interesting: Why they don't drink wine on Mad Men.
P.S. More etiquette tips, including how to eat dinner and how to introduce someone.
(Comic by Christopher Weyant for the New Yorker)