What would happen if David Letterman came onstage to do his opening monologue but nothing came out of his mouth? What if the stars of the silver screen had to improvise all their dialogue--would someone like Tom Cruise even have a career? Now you may have an inkling of what TV and screenwriters contribute to popular entertainment. And that's why the strike of the Writers Guild of America matters. They're looking for a bigger cut of burgeoning DVD revenues and growing Internet revenues. Peopling the picket lines in New York this week were Seth Myers, the Weekend Update coanchor and head writer of Saturday Night Live, and his predecessor Tina Fey, now of 30 Rock. The most recent SNL telecast included a hilarious skit with Fred Armisen posing as an overpaid studio executive. Jay Leno has contributed a sound bite supporting his writers and Letterman describes the producers as "cowards, cutthroats, and weasels." But Jon Stewart of The Daily Show is really putting his money where his mouth is. He is personally paying the salaries of his writers for the duration of the strike. These folks know on which side their bread is buttered.