In the household metered markets Thebeat out with a 3.6/9 (household /share) versus a 3.0/7. In the 25 markets with Local People Meters the also won out with adults 18-49, but by a more narrow margin of 1.2 vs. 1.0 that is certainly subject to change in the fast national and final numbers.
Update: Because there was a question, and I had it already, here is the final chart ofvs. Letterman weekly 18-49 ratings. It doesn't include the week of repeats that preceded the Olympics.