Who among us hasn't fallen victim to a little celebrity worship? Whether the object of our affections are movie stars, athletes, poets or politicians (just look at how many Americans are getting a buzz off Sarah Palin and Barack Obama), we're hungry for information about them. We want to know what they're saying, what they're wearing, where they're going and whom they're with. Indeed, billion-dollar industries revolve around our indefatigable obsession with celebrities. And now new scientific research has found that celebri-crushes are not only common but maybe even healthy: a study published Sept. 10 suggests that the act of celebrity worship may be a boon to some people's self-esteem....