Your Neighbor Denounces cellular telephones as instruments of the devil. Your niece swears that no one expects thank-you letters anymore. Your father-in-law insists that married women have to take their husbands' names. Your guests plead that asking them to commit themselves to attending your party ruins the spontaneity. Who is right? Miss Manners, of course. With all those amateurs issuing unauthorized etiquette pronouncements, aren't you glad that...