Say your please and thank yous. Ladies first. The fork goes on the left side of the plate. The rules of manners and etiquette in everyday life are well established, and for most of us, ingrained since childhood. But when BlackBerrys, iPods and laptops enter the equation, things get a little foggier. And everyone has seen people who could use a gentle prod in the right direction: The idiot yammering on his cell phone in a five-star restaurant, the guy on the subway with his headphones around the neck cranked to max, or the oblivious girl gazing into her iPhone while her date across the table looks for the quickest way to make an exit. But it isn't always that easy.