09/14/2009 05:12 am ET | Updated May 25, 2011

Late Night Booking Wars Reach New Heights: "I've Never Seen It Like This"

Now, with O'Brien inheriting "Tonight" and Jimmy Fallon installed at "Late Night," the addition of "Leno" has opened a new front in the booking wars.

"I've never seen it like this," says a late-night insider of the jockeying to secure guests. "Now people are being much more strategic, and they are planning it out far more in advance."

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