Last week, for the first time ever, Keith Olbermann's Countdown, program was the No. 1 cable news show at 8 p.m. for adults in the 25–54 age demographic. It defeated Bill O'Reilly's Factor, which MSNBC hadn't bested since 2001. Likewise, the network as a whole beat Fox News in prime time for the first time (not including debate nights) since the same year.

On Friday night, Laura Ingraham subbed in for Bill O'Reilly, and if you discount that night, O'Reilly comes out on top. But since it was just announced that Ingraham will get her own show on Fox News, it's noteworthy that she doesn't do as strongly against MSNBC.

O'Reilly still trounces Olbermann among total viewers, but many of those are out of (read: older than) the key advertising demographic. TVNewser has a crowing e-mail from NBC News senior vice-president Phil Griffin.

We expect the Fox News crack publicity team is already spinning on behalf of O'Reilly's "No Spin Zone" as we type. We can't wait to see what they come up with.

MSNBC's Big Week [TVNewser/Mediabistro]