For those partial to a more formal (and stuffier) guide to current etiquette than Judith Martin's delightful Miss Manners' Guide for the Turn-of-the Millenium (p. 1468), here comes more white-gloved counsel from Baldrige, once Jackie Kennedy's White House chief of staff. Much of the advice offered here is traditional, covering the customary subjects of tipping, weddings, table manners (""As a guest, serve yourself modest portions of whatever is passed on or whatever is on the buffet""), etc.--but, as the title says, Baldrige does forge with measured sensibilities into modern-day etiquette problems here, covering ""The Kinds of Drugs Around Us,"" ""Safe Sex and Bisexuality"" (""It is totally reprehensible for a man who is bisexual to have an affair with or marry a woman who thinks he is straight""), and so on. Old-fashioned but very detailed advice, then, from a reliable source.