One of the perks of working in the television business is that you occasionally (or during the summer months frequently) get to see pilots before they air on television... in most cases, many months before they premiere. So yesterday I was therefore fortunate to view the pilot for Showtime's new drama series, Dexter , based on the novels by Jeff Lindsay. Dexter stars Michael C. Hall , whom most viewers will remember from Six Feet Under . Here, Hall portrays the title character who is vastly different from David Fisher, the character he played for several years on Six Feet Under ...well, except for the connection to death. For one thing, Dexter is a forensic investigator--his specialty is blood splatter--and for another, he's a serial killer. But before you get all uptight about it, he's a serial killer who only kills other serial killers. Gruesomely. Brutally. He stalks them, captures them, and kills them, chopping up their bodies and disposing of them while holding onto a