The Kilborn rep was once a little more fiery than now.  He was one of ESPN's top "SportsCenter" anchors (and presumably an inspiration for Aaron Sorkin's short-lived ABC show "Sports Night") before heading off to Comedy Central's "Daily Show," which he now says was perhaps a little politics-sated for his taste.  "I kind of liked covering politics in smaller doses," he explains.  "Anything over five minutes [became] kind of tedious."  Be he made a mark, established some clever bits ("Five Questions") and drew the attention of Esquire, where in a published interview he made some ungentlemanly remarks about his producer, Lizz Winstead, which led to a brief suspension. Some critics drew a bead on the naughty, unpolitically correct host and haven't removed it.  But Letterman and CBS were looking for a younger male audience at 12:35 to replace Tom Snyder; Kilborn got the call. Burnett says: "We're very happy with Craig.  He's done a fantastic job, and anyone in this day and age who can stay on TV for five years is a huge success."  Does Dave watch?  "As a rule, Dave does not watch a lot of television, [but] he told me he thinks it's great." Another story: Kilborn's in a Mexican restaurant in Farmer's Market in Los Angeles a couple of weeks ago when an elderly gentleman approaches and asks about the food.  He points to something: "Is that Hawaiian food?"  No, no," says Kilborn.  "It's Mexican."  "Are you sure?"  "Yes."  And so it goes for some time. The gent leaves, and then comes back a few minutes later.  "'You're voice sounds familiar,' he says.  'Are you Craig Kilborn?'" At least he didn't ask about "Old School."