Good manners are the way to happiness, says Letitia Baldrige, and here she provides a guide to doing the right thing--which comes down to being nice to people so that they`ll feel good and make others feel good, in a kind of chain reaction of good will. She tackles not only the usual areas of etiquette (tipping advice, wedding etiquette, etc.) but the problems that are unique to contemporary life, such as email, using condoms, and managing complicated family groups at weddings.