Entertainment A-List No. 7: Tina Fey

NEW YORK (AdAge.com) -- On NBC's "30 Rock," Tina Fey's character is a neurotic named Liz Lemon. But during a recent promo for the show, the announcer referred to her not as Liz but as Tina. It's a terrific example of how the former "Saturday Night Live" head writer is a brand all her own -- an on-air and online juggernaut who's one of the strongest forces in entertainment today.