Who's up "Up." Pixar's latest is garnering rapturous buzz: "Uncharted emotional terr- itory" (Variety); "joyously buoyant" (Holly-wood Reporter); "deeply affecting" (Time). Who's down First, Sam Mendes had to listen to wife Kate Winslet moon over "soulmate" Leonardo DiCaprio in the runup to "Revolutionary Road." Now Winslet reveals she never leaves home without an engraved ring from Leo. And she's not telling what it says.