Here's who's sitting down on the couch on the late night shows.

• Charlie Rose: a discussion on diseases of the brain
• The Daily Show: Stephen Prothero (repeat)
• The Colbert Report: Rep. Tom Delay and Randy Kearse (repeat)
• The Late Show with David Letterman: Madonna and Melissa Etheridge (repeat)
• Jay Leno: Matthew McConaughey, The Killers, and Opie & Anthony (repeat0
• Jimmy Kimmel Live: Dylan McDermott, Tom Bergeron, and Sea Wolf (repeat)
• Tavis Smiley: David Kyuman Kim and Cathie Black
• Late Night with Conan O'Brien: David Duchovny, Tim Gunn, and Kevin Brennan (repeat)
• The Late, Late Show with Craig Ferguson: Teri Garr and Dwight Yoakam (repeat)
• Last Call with Carson Daly: David Gray, Girls Next Door, and Two Dudes Catering

• At 8, ABC has another new installment of Duel.
• FOX has a new Are You Smarter Than A Fifth Grader? at 8, followed by a new Don't Forget The Lyrics.
• NBC has a new Clash of the Choirs at 8.
• Also at 8: if you've never seen the original Ramsay's Kitchen Nightmares, there are two episodes on BBC America starting at 8.
• AT 9, HGTV has a new Divine Design.
• Lifetime has the movie The Christmas Shoes at 9.
• There's a Christmas episode of Home Improvement on Nickelodeon at 9.
• The History Channel has the movie The Adventures of Young Indiana Jones: Passion For Life, which I believe is a repackaged movie version of the series? It's on at 9.
• It seems to be "Christmas Angel Night" on Hallmark, with the movie When Angels Come To Town at 9, then the movie Papa's Angels.

Check your local TV listings for more.