Now what? David Letterman dropped a bombshell on his show Thursday night, telling his “little story” about blackmail and sex, and doing it in such a unique way that it made for extraordinary television. Letterman continues to steal the late-night thunder from Leno and Conan… there was the Sarah Palin flap, the Obama interview, the Madonna visit… now this scandal that seemingly came out of nowhere. No one can predict how this is going to play out, how it will affect Letterman and his family, wife Regina and son Harry, the comedian’s image and his audience. Show business is bizarre… but I’m guessing Letterman, who has been gaining ground in the late-night time slot, will attract even more viewers. Rival late-night comics who mine the controversy will only give Dave more attention. Can anyone on SNL do Letterman? Keep watching.