Jay and Dave are back at it again in late night, and I’ll continue to chart their weekly adults 18-49 ratings averages as long as there’s reader interest. Jay took the first two weeks, but late night’s not a sprint, its a marathon, and who knows what lies ahead.

For historical reference, here are last season’s 18-49 season-to-date averages through March 20, 2009:

NBC “Tonight,” 1.4 rating/6 share
CBS “Late Show,” 1.1/4

And for additional historical reference, here is the tally of the adults 18-49 ratings for the entire run of Conan O’Brien’s Tonight Show, except the final week of repeats prior to the Winter Olympics.

Posted by:TV By The Numbers

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