via ABC press release:

Posting its Best Numbers in Viewers and Adults 18-49 Since March,

“Jimmy Kimmel Live” Delivers its Strongest Summer Performance in 3 Years

For the First Time Ever, “JKL” Outdraws “Fallon” in Viewers Twice in One Week

“JKL’s” Thursday Telecast Tops an Original Telecast of

CBS’ “Late Show with David Letterman” In Adults 18-49 for the First Time Ever

“JKL” Betters CBS’ “Late Show Late Show with Craig Ferguson”

In Adults 18-49 by 20%, its Largest Margin in Nearly 1 Year

Weekly National Ratings:

During the week of June 8, 2009, ABC’s “Jimmy Kimmel Live” registered solid double-digit increases over the previous week of 26% in Total Viewers (1.68 million vs. 1.33 million) and 35% in Adults 18-49 (795,000 vs. 589,000), drawing its best numbers in both Nielsen measures since March – since weeks of 3/23/09 and 3/2/09, respectively. In fact, “JKL” turned in its best performance during the summer in 3 years – since week of 6/19/06.

• Competitively, “JKL” topped NBC’s “Late Night with Jimmy Fallon” in Total Viewers on its Tuesday (2.02 million vs. 1.86 million – 6/9/09) and Thursday (2.16 million vs. 2.81 million – 6/11/09) telecasts, representing the first time ever that the ABC late-night program outperformed “Fallon” in viewers twice in one week.

• Thursday’s (6/11/09) telecast of ABC’s “Jimmy Kimmel Live,” topped CBS’ “Late Show with David Letterman” in Adults 18-49 (1.15 million vs. 1.11 million), outdelivering an original telecast of the CBS program for the first time ever in the key young adult sales demo.

• For the week, “JKL” bettered CBS’ “The Late Late Show with Craig Ferguson” among Adults 18-49 by 20% (795,000 and 665,000), posting its largest margin of victory over the CBS late night program in the young adult demo in nearly 1 year – since week of 7/14/08.

Source:  NTI, National Live + Same Day Program Ratings, week of 6/8/09, or as dated.  Season-to-date averages based on Most Current Ratings. Comparisons based on 000s. Summer: weeks between Memorial Day and Labor Day.