The Mavericks' Mark Followill is a rising star and the Rangers' Eric Nadel is classically listenable. But in the Cowboys' Brad Sham, metroplex sports fans have an icon at the threshold. In an era when broadcasters exploit their booths as Gong Show stages used to trot out contrived, cutesy catch-phrases, Sham's style is both understated and underrated. He can be as smooth as a Roger Staubach spiral or as hyper as Keyshawn Johnson after a third-down catch. He has a knack for criticizing without ruffling feathers and for encouraging you to root without being a cheerleader. Like Chick Hearn with the Lakers, Vin Scully with the Dodgers and Harry Caray with the Cubs, Sham (in his 27th season with the team) is a legend. He started by hosting Dallas' first sports radio talk show. Here's hoping he ends up in the Ring of Honor.