WASHINGTON -- Lam Nguyen's job is to sit for hours in a chilly, quiet room devoid of any color but gray and look at pornography. This job, which Nguyen does earnestly from 9 to 5, surrounded by a half-dozen other "computer forensic specialists" like him, has become the focal point of the Justice Department's operation to rid the world of porn. In this field office in Washington, 32 prosecutors, investigators and a handful of FBI agents are spending millions of dollars to bring anti-obscenity cases to courthouses across the country for the first time in 10 years. Nothing is off...