TV Today

The Ellen DeGeneres Show

(3-4 p.m., NBC10) - Singer Mariah Carey discusses her new fragrance; Duran Duran performs.

Oprah Winfrey

(4-5 p.m., 6ABC) - Children showcase talents.

Stand Up to Cancer

(8-9 p.m., CBS3, 6ABC, NBC10) - This telethon is only an hour, but it packs a lot of star power into the time period and the cause. Among those slated to appear are Jennifer Aniston, Lance Armstrong, Hilary Swank and Sally Field.

Are You Smarter Than a 5th Grader?

(8-10 p.m., Fox29) - Host Jeff Foxworthy's folksy charm and the unaffectedness of the fifth graders have made this game show, starting a new season tonight with a two-hour episode, a hit.

Monk

(9-10 p.m., USA) - In this new episode, Monk (Tony Shalhoub) is the subject of a TV show relating how he helped catch a serial killer.

Late Show With David Letterman

(11:35 p.m.-12:35 a.m., CBS3) - Actor John Malkovich; actress Hayden Panettiere; Steve Earle performs.

Tonight Show With Jay Leno

(11:35 p.m.-12:35 a.m., NBC10) - Actress Eva Mendes; the Game performs.

Jimmy Kimmel Live

(12:05-1:05 a.m., 6ABC) - Actress Sarah Jane Morris; Black Kids perform.

Late Late Show With Craig Ferguson

(12:35-1:35 a.m., CBS3) - Actress Eva Longoria Parker; Jamie Lidell performs.

Late Night With Conan O'Brien

(12:35-1:35 a.m., NBC10) - Actor Jerry O'Connell.