Alec Baldwin, Jay Thomas, Darlene Love

Susan Sarandon, Michael Symon, Colbie Caillat

Maggie Gyllenhaal, John Witherspoon, a Top Ten List presented by Stewie

Tobey Maguire, Tom Dreesen, Alicia Keys

Jude Law, toy expert Shannon Eis, Matisyahu

Robert Downey Jr., Kris Allen

Sarah Jessica Parker, Leona Lewis

Hugh Grant, Zoe Saldana, Alicia Keys

Kyra Sedgwick, Brian Scott McFadden, Joe Perry

Kate Hudson, Dr. James Hansen, Tori Amos

Rachel Weisz, Maryjean Ballner, Rob Thomas

Barbara Walters, Blakroc

Ray Romano, Anna Kendrick

Natalie Portman, Adam Lambert

Zac Efron, Carrie Fisher, Rihanna

Robin Williams, Ashley Greene

Viggo Mortensen, Paula Poundstone, Lyle Lovett

Stephen Colbert, Emily Blunt, John Mayer

Stupid human tricks, Robert Pattinson, Ray Davies

Penelope Cruz, Joe Cada, the Script

Sharon Stone, Seth Meyers, Wyclef Jean with Cyndi Lauper

Mariah Carey, Kumail Nanjiani

Kid Scientists, Amanda Peet, the Cribs with Johnny Marr

Andre Agassi, Kate Walsh, Norah Jones

Jack Hanna, Shakira

Bill Murray, Gabourey "Gabby" Sidibe

Ricky Gervais, Brian Regan, Ralph Stanley and the Clinch Mountain Boys

Derek Jeter, Jorge Posada & Andy Pettitte, Bill Maher, Keith Urban

Bill Cosby, Ryan Bingham

Al Gore, Brad Paisley, a Top Ten List presented by Michael Buble

Julia Louis-Dreyfus, Guy Fieri, Carrie Underwood, a Top Ten List presented by New York City Marathon winner Meb Keflezighi

Regis Philbin, Brian Regan, Weezer

Tom Hanks, Weezer, a Top Ten List presented by Chad Ochocinco

Patrick Dempsey, Bud Selig, Sting

Courteney Cox, William Knoedelseder, Florence and the Machine

Charles Barkley, Cheryl Hines, Harper Simon

Uma Thurman, Tim McGraw

Don Rickles, Built to Spill

Tina Fey, Chris "Mad Dog" Russo, Mika

Sienna Miller, Aziz Ansari, Dead by Sunrise

Garry Shandling, Kaley Cuoco, Tim McGraw

Jon Hamm, Andy Kindler, Brett Dennen

Kristin Davis, Barry Sonnenfeld

Vince Vaughn, Carey Mulligan, Rosanne Cash

Paul Shaffer, Eliza Dushku, KISS

Steve Martin, Lea Michelle

Larry David, Tom Russell

Woody Harrelson, Kim Kardashian

Madonna, Harry Connick Jr., a Top Ten List presented by the New York Rangers

Kelsey Grammer, Alyson Hannigan, Miranda Lambert

Felicity Huffman, Dr. Mehmet Oz, the Avett Brothers, a Top Ten List presented by Brody Jenner

Bruce Willis, LL Cool J, Noisettes

Craig Ferguson, Kristin Chenoweth, Snow Patrol, a Top Ten List presented by New Zealand Prime Minister John Key

Stupid Pet Tricks, Simon Baker, Mary J. Blige

Former President Bill Clinton, LeBron James

President Barack Obama

Michael Douglas, Leighton Meester, Kid Cudi

Matt Damon, Jack Hanna, a Top Ten List presented by Shakira

Jay-Z, Martha Stewart, George Jones

Former Prime Minister Tony Blair, Julianna Margulies

Tracy Morgan, Leslie Mann, Diane Birch

Neil Patrick Harris, Steve Mazan, Edward Sharpe & the Magnetic Zeros

Billy Crystal, John Fogerty

Jason Bateman, Dr. John P. Holdren

Jeremy Piven, Rumer Willis, Black Crowes

Dock Diving Dogs, Howie Mandel, Dirty Projectors

Artie Lange, Todd Barry, Imogen Heap

Andy Roddick, Rachael Ray, Mutemath

Anne Heche, Jim Parsons, Care Bears on Fire

Mary-Louise Parker, Eugene Levy, Jet

Anna Wintour, Mark Teixeira

Christina Applegate, Brendan Benson, Patton Oswalt

Renee Zellweger, Gary Mule Deer

Mike Myers, Ken Burns

Donald Trump, Diane Kruger, Billy Currington, a Top Ten List presented by Britney Spears

Quentin Tarantino, Eric Ripert, Robert Cray

Regis Philbin, Ted Alexandro, Dave Matthews Band

Adam Sandler, Cage the Elephant

Amy Adams, Tom Dreesen, Elbow

Katie Couric, Silversun Pickups

Eric Bana, Dave Matthews Band, a Top Ten List presented by Chicago White Sox star Mark Buehrle

Amy Poehler, Nick Griffin, Judy Collins

Sean "Diddy" Combs, Vera Farmiga, Ginuwine with Missy Elliott

Tracy Morgan, Leslie Mann, Diane Birch

Kevin Spacey, Jesse James, the Flatlanders, a Top Ten List presented by Stewart Cink

Katherine Heigl, Jeff Altman, Spinnerette

Tom Arnold, Metric, a Top Ten List presented by Dave's mom Dorothy

Anderson Cooper, Anna Paquin, Grizzly Bear

Paul McCartney, a Top Ten List presented by Bruce Willis

Edie Falco, Michael Showalter, Wilco with Feist

Jonah Hill, Gar Ryness, Kelly Clarkson

Rainn Wilson, Larry Miller, Maxwell

Daniel Radcliffe, Veronika Part, Levon Helm, a Top Ten List presented by Bruno

Queen Latifah, Emma Watson

Sacha Baron Cohen, Joel McHale

Serena Williams, Hayden Panettiere, Conor Oberst and the Mystic Valley Band

Martin Short, Regina Spektor

Johnny Depp, Megan Fox

Ray Romano, St. Vincent

Sandra Day O'Connor, MSTRKRFT with John Legend, a Top Ten List presented by Lucas Glover

Samuel L. Jackson, Emeril Lagasse, Iggy Pop & the Brighton Port Authority

Jada Pinkett Smith, Michael Cera, the Sounds

Danny DeVito, Bear Grylls, Phoenix

Ryan Reynolds, Padma Lakshmi, the Eels

Michelle Pfeiffer, Judah Friedlander, Ian McLagan & the Bump Band

Jack Black, M.A. Sanjayan

Sandra Bullock, Pete Correale, P.J. Harvey & John Parish

Denzel Washington, the Jonas Brothers, a Top Ten List with Regis Philbin

Kathy Griffin, Stupid Human Tricks, Sonic Youth, an NBA Finals report by Phoenix Suns' Steve Nash

Julia Roberts, Black Eyed Peas

Howard Stern, Mos Def

Paris Hilton, Calvin Borel, Steven Wright

Elvis Costello, a Top Ten List presented by Neil Patrick Harris

Jessica Biel, Zach Galifianakis, Steve Earle

Jack Hanna, John Krasinski

Bill Cosby, Helio Castroneves, Melody Gardot

Ricky Gervais, Green Day

Amy Sedaris, Ed Helms, Jean Redpath

Stephen Colbert, General Motors Vice Chairman Bob Lutz, Grizzly Bear

Jane Fonda, Piedmont Bird Callers, Kenny Chesney

Ben Stiller, White Rabbits

John Goodman, Tommy Tiernan, Mastodon

Kid Scientists, Teri Hatcher, Rick Ross with Magazeen, a Top Ten List presented by Ron Howard

Robin Williams, Wynton Marsalis

Alec Baldwin, Maya Rudolph, Chrisette Michele

Tom Hanks, the Killers

Matthew Broderick, Brian Regan, Chris Cornell

Norm MacDonald, a Top Ten List presented by Leonard Nimoy, Animal Collective

Bruce Willis, Ben Harper & Relentless7

Liev Schreiber, Dr. Sanjay Gupta, Franz Ferdinand

Gordon Ramsay, Chris Pine, Keri Hilson with Kanye West

Kiefer Sutherland, Jim Norton, Bat for Lashes

Regis Philbin, a performance by the Broadway cast of "Hair"

Jennifer Garner, Tesla Motors CEO Elon Musk, Manchester Orchestra

Dolly Parton, Zachary Quinto

Matthew Fox, Carol Leifer, the All-American Rejects, a Top Ten List presented by Matthew Stafford

Michael Keaton, Lily Allen

Jamie Foxx, Lauren Conrad, the Dead

Beyonce, Jim Parsons

Nathan Lane, Tinted Windows

Jeff Goldblum, Jeff Dunham

Russell Crowe, Joe Wong

Matthew Perry, Elisha Cuthbert, Rascal Flatts

Drew Barrymore, Jack McBrayer, Neko Case

Kelly Ripa, Bill Scheft, Yeah Yeah Yeahs

Zac Efron, Mike Golic and Mike Greenberg, A.C. Newman with Nicole Atkins

Denis Leary, Diana Krall

Michael J. Fox, the Fray

Marg Helgenberger, Francisco Palacios, Ray LaMontagne

Bill O'Reilly, Marianne Faithfull

Seth Rogen, Tom Dreesen, Adele

Christina Applegate, Jim Gaffigan, Jesse Harris with Norah Jones

Mary Tyler Moore, Blake Lively, White Lies

Hugh Laurie, Bloc Party

David Spade, Richard Zoglin, David Sanborn and Sam Moore

Billy Crystal, Kara DioGuardi, a Top Ten List presented by Owen Wilson

Craig Ferguson, Ginnifer Goodwin, Modest Mouse

Julia Roberts, Bell X1

Nicolas Cage, Rachel Maddow

Will Ferrell, Cursive

Andy Samberg, Paul Teutul Sr., the Broadway cast of "West Side Story"

Tom Brokaw, An Horse

Stupid Pet Tricks, Paul Rudd, Razorlight

Russell Brand, Jack Hanna

Jason Segel, Brian Kiley, U2

Jon Stewart, U2, a Top Ten List featuring 10 Team USA members from the World Baseball Classic

Dr. Phil McGraw, U2

Felicity Huffman, Artie Lange, U2

Katie Couric, U2

Barbara Walters, Mike Birbiglia, Shemekia Copeland

David Spade, Jeffrey Sachs, David Sanborn with Sam Moore

Donald Trump, Antony and the Johnsons

Bonnie Hunt, M. Ward

Ellen Pompeo, Daytona 500 winner Matt Kenseth, Willie Nelson with Asleep at the Wheel

Martha Stewart, Jake Johannsen, Matt Nathanson

Chris Russo, the Jonas Brothers, Ashford & Simpson

Joaquin Phoenix, Bar Refaeli, Anthony Hamilton

The crew of US Airways "Miracle On The Hudson" Flight 1549, Heartless Bastards

Naomi Watts, Danny McBride, 2009 Sports Illustrated Swimsuit Issue cover reveal

Dakota Fanning, Keith Alberstadt, Beirut

Isla Fisher, extreme fisherman Matt Watson, Mark Olson and Gary Louris, a Top Ten List presented by Lil' Wayne

Joe Torre, Demetri Martin, Lyle Lovett and John Hiatt

Rod Blagojevich, Richard Jenkins

Ben Roethlisberger, Steve Martin

Mary Hicks, the Gaslight Anthem

Renee Zellweger, Tony Dungy, Graham Nash sits in with the band

Lauren Graham, Guy Fieri, MENEW

Evangeline Lilly, Seth Meyers, Andrew Bird

Brian Williams, Ben Kweller

Zach Braff, Arj Barker, The Airborne Toxic Event

Kyra Sedgwick, Gwen Ifill

Clint Eastwood, Randy Rogers Band

Salma Hayek, Jimmie Walker

Billy Crystal, Kara DioGuardi

Kiefer Sutherland, Wendy Liebman

Kate Winslet, Marv Albert

Ricky Gervais, Rose Byrne, Okkervil River

Kevin James, Becky Quick, Erin McCarley

Kate Hudson, Glasvegas