text: Letterman returned on a limited basis on February 18, in a show which premiered three days later. To ease his transition back to air, temporary guest hosts carried the show. Bill Cosby (February 22), Kathie Lee Gifford (February 24), David Brenner (February 29), Nathan Lane (March 2), Janeane Garofalo (March 7). filled in on the first week.
  In February and March 2003, Letterman missed 14 shows due to shingles. Letterman had various guest hosts during his illness-inflicted absence: Bruce Willis (February 26), John McEnroe (February 27), Regis Philbin (February 28), Whoopi Goldberg (March 10), Vince Vaughn (March 11), Elvis Costello (March 12), Will Ferrell (March 13), Megan Mullally (March 14), Brad Garrett (March 17), Tom Dreesen (March 18), Bonnie Hunt (March 19), Paul Shaffer (March 24), Bill Cosby (March 25), and Luke Wilson (March 26).
  In June 2003, Letterman had guest hosts on Fridays. They included Tom Arnold (June 6), Tom Green (June 13), Kelsey Grammer (June 20), and Jimmy Fallon (June 27). Letterman's weekly absence caused the ratings deficit between his show and Leno's to increase, so Letterman ended this experiment a month after it began.
  Paul Shaffer hosted January 19, 2005, when Letterman went to receive an award for his racing team's victory in the 2004 Indianapolis 500.
  On March 20, 2007, Letterman fell ill less than an hour before the show started, and scheduled guest Adam Sandler took his place as host. Actor Don Cheadle, Sandler's co-star in the film Reign Over Me, appeared as a guest on a moment's notice.
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