UPDATE!! A surprising stat outside the 18-49 demo. Bill Carter writes in the New York Times:

Mr. Letterman, who again addressed his admissions that he had sexual relationships with some of his staff members, attracted 5.7 million viewers Monday night, his biggest audience since President Obama was a guest two weeks ago. That was easily more viewers than Mr. Leno, who scored his lowest audience total yet for his new 10 p.m. show, with just 4.5 million viewers.

NBC’s two other prime-time entries, “Heroes” and “Trauma,” both finished with fewer viewers than Mr. Letterman, 5.5 million and 5.4 million.

Original post:

I am – Hercules!!

No more Monday premieres! The 18-49 rankings (prior weeks in parentheses):

MONDAY PRIMETIME:
5.1 (5.7) (6.5) House
4.5 (5.1) (4.6) Big Bang Theory
4.3 (4.7) (4.4) Two and a Half Men
4.0 (3.6) (4.1) Dancing With The Stars
3.9 (4.1) (4.3) CSI: Miami
3.4 (3.6) (3.5) How I Met Your Mother
3.0 (2.9) (----) Lie To Me
3.0 (2.3) (2.3) Castle
2.8 (3.1) (3.2) Accidentally On Purpose
2.3 (2.3) (2.7) Heroes
1.8 (2.3) (----) Trauma
1.4 (1.8) (1.8) The Jay Leno Show
1.1 (1.2) (1.1) Gossip Girl
1.0 (1.2) (1.2) One Tree Hill

MONDAY LATE NIGHT:
1.3 The Late Show With David Letterman
0.8 The Tonight Show With Conan O’Brien
0.7 The Late Late Show With Craig Ferguson
0.5 Jimmy Kimmel Live
0.5 Late Night With Jimmy Fallon

* “Letterman” apparently benefited from an alleged real-life blackmail attempt and visits from Steve Martin and Martin Short; it crushed “Conan.”

* Primetime’s “Leno” fell to its lowest rating on any night to date, now only a tenth of a point ahead of “Letterman’s” late-night show in 18-49.

* ABC’s Nathan Fillion hourlong “Castle” posted a BIG (36%) gain at 10 p.m. as timeslot competitors “Leno” and “CSI Miami” gave up ground. (The Hollywood Reporter suggests however that the ABC overnight figures may have been inflated by pre-emptions at ABC's Milwaukee and Minneapolis affiliates that allowed them to broadcast ESPN's Monday night Vikings-Packers game.)

* In this football-enhanced TV environment ABC’s “Dancing With The Stars” ascended while “House,” CBS’ comedies, NBC’s dramas and The CW’s young-adult dramas all declined against it.

* “Lie To Me,” which plummeted 44% last week from its January premiere, was the only non-ABC show to post an increase over its prior Monday.

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Next Month!!