via CBS press release (you can see the NBC spin on the matter here):
CBS's "LATE SHOW with DAVID LETTERMAN" IN CLOSEST COMPETITIVE POSITION TO "THE TONIGHT SHOW" IN VIEWERS SINCE DECEMBER 2005
LATE SHOW Tops "Tonight" on Three Nights Last Week
Both LATE SHOW and THE LATE LATE SHOW Posts Audience Gains Compared to Same Week Last Year
CBS's LATE SHOW WITH DAVID LETTERMAN scored a late night victory in households and was in its closest competitive position to "The Tonight Show" (separated by only 100,000 viewers) since December 2005, according to Nielsen live plus same day ratings for the week ending June 12, 2009.
LATE SHOW WITH DAVID LETTERMAN delivered a 2.7/07 in households with an average of 3.67m viewers, up +4% in both households (from 2.6/07) and viewers (3.52m) compared to the same week last year. LATE SHOW beat "The Tonight Show" in households (2.7/07 vs. 2.6/06, +4%) and on three nights last week in viewers: Tuesday (3.64m vs. 3.47m), Thursday (3.99m vs. 3.57m) and Friday (3.75m vs. 3.69m). LATE SHOW was in its closest competitive position against an all-first run week of "Tonight Show" broadcasts since the week ending December 2, 2005 (the week Oprah Winfrey appeared on LATE SHOW).
Television year-to-date, LATE SHOW is up +3% in viewers (3.80m from 3.68m), even in households (2.7/07), adults 18-34 (0.7/03), adults 18-49 (1.1/04) and adults 25-54 (1.4/05) compared to last year.
THE LATE LATE SHOW with CRAIG FERGUSON posted a 1.3/05 in households with 1.72m viewers in the week ending June 12, 2009, up +2% in viewers (from 1.69m) and even in households compared to the same week last year. THE LATE LATE SHOW was even in adults 25-54 (0.7/04), adults 18-49 (0.5/03) and adults 18-34 (0.4/02) compared to the same week last year.
Television year-to-date, LATE LATE SHOW is up +8% in households (1.4/05 from 1.3/05), +9% in viewers (1.88m from 1.72m) and even in adults 25-54 (0.7/04), adults 18-49 (0.6/03) and adults 18-34 (0.4/02) compared to the 2007-08 television year.