Broadcast Late Night Show Ratings....

Broadcast Late-Night Shows - Weekly Average Ratings (week of March 5, 2012)
ABC: Nightline 3.73 million total viewers; 1.2 and 1.43 million A25-54; 0.8 and 1.05 million A18-49
NBC: Tonight Show 3.20 million total viewers; 1.1 and 1.28 million A25-54; 0.8 and 1.02 million A18-49
CBS: Late Show 2.73 million total viewers; 1.0 and 1.21 million A25-54; 0.7 and 910,000 A18-49
Source: Nielsen, NTI