Guests: Senator Bill Bradley, author Christopher Hitchens, rapper Mos Def, author Salman Rushdie Topics: Banking crisis, Legalization of marijuana, Nuclear proliferation

Guests: CNN host Larry King, MSNBC host Chris Matthews, former White House Homeland Security advisor Frances Townsend, NAACP President Ben Jealous, humorist P. J. O'Rourke Topics: 2009 digital television transition, Holocaust Memorial Museum shooting, racism, affirmative action, nomination of Judge Sonia Sotomayor to the Supreme Court, terrorism, car culture in the United States, socialism

Guests: Commentator Paul Begala, BBC reporter Katty Kay, blogger Meghan McCain, columnist Joel Stein, writer Hooman Maj Topics: Iranian presidential election, 2009, health care reform, David Letterman joke controversy, sexuality and infidelity in politics, 2009 imprisonment of US journalists by North Korea

Guests: Joe the Plumber, Journalist David Frum, comedian Carol Leifer, writer Reihan Salam, reporter Sam Donaldson Topics: 2009 G-20 London summit, tax cut, health care, Carbon tax, nuclear energy

Guests: Ex-gov. Howard Dean (D-VT), comedian Dana Gould, writer Randy Cohen, author Bethany McLean, ex-CIA agent Robert Baer Topics: Obama's first 100 days, torture memos, economy, gun control, environment and global warming, children's health

Guests: Rep. Barney Frank (D-MA), journalist Fareed Zakaria, NBC News foreign correspondent Richard Engel, former FDA chief David Kessler Topics: 2009 swine flu outbreak, state of the Republican Party, terrorism, Souter's resignation, Arlen Specter's party switch, Israel

Guests: Democratic consultant James Carville, Family Guy creator Seth MacFarlane, author Naomi Klein, journalist Matt Taibbi, author Reza Aslan Topics: Tax evasion by big companies, torture, Pakistan & Taliban, US military handing out bibles, gay marriage

Guests: Creator of The Wire David Simon, economist Elizabeth Warren, conservative commentator Amy Holmes, National Review's Richard Brookhiser, columnist Dan Savage Topics: Torture, climate change, gay marriage, War on Drugs

Guests: Nobel Prize-winner Muhammad Yunus, Pulitzer Prize-winner and Newsweek editor Jon Meacham, M.I.T. economist Simon Johnson, and rapper M.I.A. Topics: Global economic crisis, the progress of the Obama administration, Dick Cheney, religion in the United States

Guests: Actor Hill Harper, former U.N. Ambassador John Bolton, former House Representative Heather Wilson, documentarian Michael Pollan Topics: State of the Republican Party, torture and Guantanamo Bay, North Korea's nuclear weapons threat, nomination of Judge Sonia Sotomayor to the Supreme Court, and California Supreme Court's decision regarding California's Proposition 8

Guests: Actor and comedian D. L. Hughley, Council of Foreign Relations president Richard Haass, novelist Paula Froelich, journalist Jeremy Scahill, Fortune editor Matt Miller Topics: Obama's visit to the Middle East, terrorism, abortion debate and the murder of Dr. George Tiller, gay marriage, health care reform in the United States

Guests: Joe Scarborough, actor Jason Alexander, actress/playwright Anna Deavere Smith, Gov. Brian Schweitzer (D-MT), Markos Moulitsas. Topics: Sonia Sotomayor confirmation hearings, racism and the Republican Party, clean coal electricity debate, health care reform in the United States, recent sex scandals involving politicians, Israeli-Palestinian conflict, death of Michael Jackson, drug use in the United States, death of Walter Cronkite (news broke shortly before tonight's show began), 40th anniversary of the Apollo Moon Landing

Guests: Homeland Security secretary Janet Napolitano (via satellite), Iraq War veteran and California congressional candidate Anthony Woods, Susan Eisenhower, journalist John Heilemann, writer Matt Taibbi Topics: 2009 Henry Louis Gates, Jr. arrest by Cambridge police, racism and the Republican Party, Barack Obama citizenship conspiracy theories, health care reform, military-industrial complex

Guests: TV host Jay Leno, journalist Chuck Todd, Rep. Jan Schakowsky (D-IL), author Sam Harris, journalist Jeremy Scahill Topics: Health care reform, protesters bringing guns to town halls, lack of information and explanation of issues by the media, controversy over private military contractors like Blackwater, politicization of the terror alert level system in the 2004 presidential election, lack of employers offering vacation and sick leave pays in the United States

Guests: New York representative Anthony Weiner, comedian Kathy Griffin, author and veterans advocate Paul Rieckhoff, journalist Rajiv Chandrasekaran, former counter-terrorism czar Richard Clarke Topics: Healthcare reform, eighth anniversary of 9/11, response to terrorism, the wars in Iraq and Afghanistan, race and criticism of Barack Obama, the media, global warming skepticism

Guests: Filmmaker Michael Moore, fmr. New York governor Eliot Spitzer, economist Paul Krugman, director John Waters Topics: Capitalism, the economy, the housing market, gay marriage, marijuana reform, terrorism

Guests: Columnist Thomas Friedman, EPA Chief Lisa Jackson, actress Janeane Garofalo, Ohio congresswoman Marcy Kaptur, author Richard Dawkins Topics: Criticism of Barack Obama, health care reform, the senate, Iran's nuclear capabilities, religion in America, terrorism, Hollywood defending Roman Polanski

Guests: Former senator Bill Frist, actor Richard Belzer, professor Cornel West, former senator Lincoln Chafee, comedian Sarah Silverman Topics: Barack Obama winning the Nobel Peace Prize, Iran, peace, Afghanistan, Al Qaeda, the economy and the job market, income inequality.

Guests: Rep. Alan Grayson (D-FL) , Actor Alec Baldwin, comedian and actor Garry Shandling, Hardball host Chris Matthews, Maryland governor Martin O'Malley Topics: Balloon Boy incident, Afghanistan, Al Qaeda, health care reform, H1N1 vaccination concerns, ongoing efforts to repeal Don't Ask, Don't Tell, sexual harassment in the military, Rush Limbaugh's failed bid to buy the St. Louis Rams, steroid use in professional sports

Guests: Actor Ashton Kutcher, fmr. Commander in Chief of U.S. Central Command Gen. Anthony Zinni (ret.), journalist and blogger Ross Douthat, comedian Dana Gould (also reporter), actor Brad Pitt Topics: 'Death panel' claims, healthcare, income inequality, the current state of the Republican party, John Brennan 'ending' the war on terror, town hall discussions, mobs comparing Obama with Hitler, climate change.

Guests: Filmmaker Ron Howard and novelist Gore Vidal Topics: Bill conducts one-on-one interviews

Guests: Financial Times editor Chrystia Freeland, journalist Tina Brown, Rep. Maxine Waters (D-CA); via satellite, Rep. Ron Paul (R-TX), journalist Brigitte Gabriel Topics: The economy, President Obama's first month in office

Guests: Actor Alan Cumming, political satirist and journalist P. J. O'Rourke, Mayor Gavin Newsom (D-San Francisco); via satellite, political correspondent George Stephanopoulos, author Robin Wright Topics: Obama's speech, Bobby Jindal, marijuana, home ownership, Iraq, Afghanistan and troops, future of the Rep. party, Vatican and indulgences

Guests: Businessman T. Boone Pickens; Mayor Cory Booker (D-Newark); news anchor Erin Burnett; author Peter Singer Topics: The economy, green energy, charity and philanthropy, socialism

Guests: Comedian Sarah Silverman, professor Michael Eric Dyson, author Andrew Breitbart, columnist Steven Pearlstein Topics: State of the Rep. party, racism in America, the Teachers' Union, stem cell research