Conan O'Brien has reason to smile after his debut as "Tonight" show host.
His first Nielsen Media Research report card shows a 7.1 rating and 17 audience share in the nation's biggest media markets. The numbers indicate more people checked out O'Brien's show out than watched David Letterman's "Late Show" and ABC's "Nightline" combined.
A typical "Tonight" show this season had a 4.0 rating. Each ratings point represents 1 percent of the nation's homes with TV, which means 7 percent of homes had someone watching O'Brien on NBC.
O'Brien was serenaded by both comic Will Ferrell and the rock band Pearl Jam on opening night.
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