HighlightsFour crooning hopefuls will get the ax when the first viewer votes of the season are tallied on "American Idol"(Channel 5 at 8). The libations floweth on "The Office"(Channel 4, 8:30) as Jan and Michael make their relationship public at a cocktail party.

It's time to say adieu to the Cohens, the Coopers and sundry cameo-hungry indie-rockers during the series finale of "The O.C."(Channel 5 at 9).

One patient's fight to survive resonates with the entire staff on "Grey's Anatomy"(Channel 7 at 9).

On "30Rock"(Channel 4, 9:30), Jenna goes on "Hardball" and is subjected to a supreme grilling by Chris Matthews and Tucker Carlson (playing themselves, of course). Meanwhile, Jack negotiates Josh's contract, and Tracy's entourage welcomes Kenneth to the fold.

"Ghosts of Abu Ghraib"(HBO, 9:30) is previewed by Tom Shales on Page C1. Filmmaker Rory Kennedy is interviewed on Page C4.

The "Oprah Winfrey Oscar Special"(Channel 7 at 10) catches the hostess taking it easy. She's recruited Julia Roberts to interview George Clooney, Nicole Kidman to chat with Russell Crowe and Jamie Foxx to sit down with Sidney Poitier.

On "ER" (Channel 4 at 10), Abby and Pratt struggle to save a family suffering from frostbite, and Gates's alcoholic father makes a surprise visit.

On "The Sarah Silverman Program"(Comedy Central, 10:30), Silverman realizes she can't enter a girls' beauty pageant and enters her "daughter" instead, and Steve misbehaves in the back of a police car.

"Late Show With David Letterman"( Channel 9, 11:35) welcomes "The Astronaut Farmer" star Billy Bob Thornton, out-of-this-world actress Rashida Jones and musical guests Barenaked Ladies.

"The Tonight Show with Jay Leno"(Channel 4, 11:35) hosts big-screen legend Peter O'Toole and music from Hellogoodbye.

Didn't get enough of your "dawg" earlier in the evening? Stay up late and catch "American Idol" judge Randy Jackson on "Jimmy Kimmel Live"(Channel 7, 12:05).

-- Chris Richards