Last night's early metered market numbers for The Tonight Show slipped to a 4.3 household rating. For those of you keeping score at home, that's down from 7.1 for the Monday night premiere and a 5.0 rating Tuesday night. The waning ratings are hardly a surprise, and it was still enough to best the late night competition from The Late Show with David Letterman (2.8) and Nightline (2.1) / Jimmy Kimmel Live (1.2).
Ultimately Conan's ratings will begin to level off. The question is, where?