Jerry Saltz visits the New Museum's "The Generational: Younger Than Jesus” show. David Edelstein reviews State of Play, 17 Again, and American Violet. Jesse Oxfeld interviews engaged stars Jenny Powers (Happiness) and Matt Cavenaugh (West Side Story). Lissa Townsend Rodgers enjoys a hamburger with James Toback and Mike Tyson. A panel of experts runs down the highlights of the Tribeca Film Festival. Rebecca Milzoff celebrates the 90th birthday of Merce Cunningham. Three random New Yorkers review five notable new albums. Emma Rosenblum profiles The Unusuals' Amber Tamblyn. Emily Nussbaum reviews HBO's Grey Gardens.