Some have it, others don't. As 2006 gets ready to be ancient history, let's look at some of the stars, shows and networks with or without momentum on their sides. For short, we'll call it MO' and NO MO.' Ready, set, go. MO' -- Carrie Underwood. She functionally performed at the Kennedy Center Honors in tribute to Dolly Parton. And on Christmas Day she got on the Texas Stadium field with boy pal Tony Romo, even if the Dallas Cowboys QB has a little case of No Mo' at the moment. NO MO' -- Jessica Simpson. She dysfunctionally performed at the Kennedy Center Honors in tribute to Dolly Parton. So much so that she asked to be cut from the finished product. And her rumored fling with Romo turned out to be an incomplete pass. MO' -- Dancing with the Stars. Buoyed by Emmitt Smith's upset win, ABC's hoof and puff extravaganza became TV's most-talked about reality show, at least until Fox's American Idol returns in January. NO MO' -- Survivor. The Cook Island edition generated next to no buzz. How many can name its winner? Ratings remain decent, but CBS no longer has a juggernaut. MO' -- Charles Gibson. ABC's newly installed World News anchor is gaining on Brian Williams' top dog NBC Nightly News, and lately has been edging it among advertiser-coveted 25-to-54-year-olds, the principal target audience for non-entertainment programming. NO MO' -- Katie Couric. The thrill is gone, with her CBS Evening News slipping to a distant third place after early viewer windfalls. It's going to be very tough for Couric to dig out. MO' -- Heroes. NBC's new serial drama has burst into the public consciousness, already ranking a heady No. 5 for the season with 18-to-49-year-olds, the key advertiser target audience for entertainment programming. NO MO' -- Lost. Ratings are down and the storytelling is getting just a bit drowsy. Add a long layoff that stretches until February and a later Wednesday night slot that will pit ABC's twisty-turny against CBS' still potent CSI: NY. Diminishing returns are likely.