ConanConan O'Brien's debut on TBS was welcomed by an estimated 4.1 million viewers, a massive haul for basic cable and enough eyeballs to out-gun network big boys like rival Jay Leno and former mentor David Letterman.

According to viewer tallies, released by TBS and Nielsen, 'Conan' easily bested O'Brien's primary 11PM frenemies Jon Stewart and Stephen Colbert.