LATE NIGHT MOVES: The promotional blitz for Letterman's switch to CBS uses his snide-guy persona to maximum effect By BARBARA LIPPER

What's smart about David Letterman is the knowing way he mocks the conventions o

Given that CBS payed Letterman serious, Nike-style money to jump ship ($14 million a year for three years), and hasn’t yet cleared the show on all of its affiliates, this is a risk. So the irony can’t be lost on Mr. Irony himself that he’s now the object of a Jurassic Park-sized promotional campaign, the largest the network has done since the Olympics.