What's going on with investigative TV reporting lately? For a while KTVT-Channel 11 had pulled ahead of WFAA's News 8 with a consistent string of hard-hitting, well-reported stories on local government and politics. What happened on 11? Recently their biggies were "New cameras can change the way you look," "Katie Couric's day in Texas" and, our favorite mind-boggling expos?, "Schools influencing value of homes." Channel 8, meanwhile, is back in the winner's circle again with hard-hitting stories by Brett Shipp and Byron Harris on airline safety, wacked-out incompetence in the Dallas schools' administration, complaints of meshugga cops in Deep Ellum and others. All the major newscasts have competent newsreaders. It's the individual reporters and behind-the-scenes producers who make the difference. Right now, those are the people who have made News 8 the one to watch at 6 and 10.