The fall 2009 TV season, from Jay to 'V'

Jay Leno walks on the stage for the

Jay Leno walks on the stage for the debut of 'The Jay Leno Show' on September 14, 2009 in Burbank, California. Photo Credit: Getty Images

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There's your 2009 fall season wrap in a word, or, if you prefer, a name.

Jay, who commands nearly one-fifth of a broadcast network's prime-time lineup.

Jay, who has completely changed the game.

Jay, who could save NBC.

(Or Jay, who might not.)

There have been "major" changes in prime-time TV lineups before, but even this powerful little word doesn't quite do justice to "The Jay Leno Show," or what it represents. If this works - and we've had a week now to get a taste - NBC may well have created a precedent for other networks looking to cut costs or even save their own necks. If it does not . . . then that's another story for another day.

Even so - surprise! - this isn't the only key development or show of the fall, although it does seem to crowd everything else out.

Here are the top 10 shows and trends to look out for over the next couple of months. You can guess numero uno:

1. Jay Leno. As you read these words, a week after debut, several questions will have already been answered. But as Leno and everyone else has observed, this isn't a one-week story, but a marathon. The impact of this move has only just begun to be felt.

2. "NCIS: ." This