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Williams’ “Nightly News” remains the clear ratings leader in the evening news category. Although ABC’s “World News” pulled closer earlier this fall, NBC has stretched out its lead in recent weeks. While still far behind in third place, the “CBS Evening News” has become more competitive since Scott Pelley took over as anchor.

NBC’s “Meet the Press” was long the dominant player in the Sunday morning political chat shows, but those days have changed. Much of that was due to the death of longtime host Tim Russert in June 2008.

The real growth on Sunday morning is on CBS, where “Face the Nation” with Bob Schieffer has significantly improved its standing against “Meet the Press” and new anchor David Gregory and Christiane Amanpour of ABC’s “This Week.”

So far this season “Meet the Press” holds a narrow lead among all viewers, but there’s been a big turnaround among 25-to-54-year-olds. Schieffer is now ahead in that category, while Gregory’s broadcast has dropped 17 percent over the past year, according to Nielsen.

Jay Leno was the king of late-night TV for more than a decade, but that’s not the case anymore. Leno has never really recovered from the failed experiment to put him in prime time.

ABC’s “Nightline” leads the late-night ratings now, and this season has increased its small advantage over Leno’s “Tonight” show and CBS’s “Late Show” with David Letterman. The “Tonight” show is essentially flat, while Letterman is losing viewers.

Despite this trend, Letterman has taken a slight lead over Leno among the demographically prized 18-to-49-year-old viewers. That means Leno’s audience, with a median age of 57, is getting older and less valuable in the eyes of the TV industry.

For NBC, these non-prime-time programs have essentially defied television gravity by staying strong as the rest of the network crumbled around them. New corporate owner Comcast Corp. seems to realize that prime time is where most of NBC’s energy should be centered. Reports are that the network’s entertainment division is spending aggressively during development season to become more competitive.

“Perhaps the best you can say is that there’s upside if they can fix what is obviously broken,” said Craig Moffett, a senior analyst for the Wall Street firm Sanford C. Bernstein.