Prepare pudding mix according to package directions using the milk; set aside. In a large mixing bowl beat cream cheese and yogurt with an electric mixer on medium speed until smooth; stir in pudding.
To assemble trifle, in a 2-1/2- to 3-quart glass bowl layer one-third of the cake cubes, one-third of the pudding mixture, and one-third of the strawberries and blueberries. Repeat layers twice. Cover and chill 4 to 24 hours. Spoon Berry Sauce onto individual serving plates; top with trifle. Makes 8 to 10 servings.
In a blender or food processor combine fresh or frozen (thawed) strawberries or raspberries, sugar, and raspberry liqueur, rum, or orange juice. Cover and blend or process until smooth. If desired, press sauce through a fine-mesh sieve to remove seeds. Cover and chill until serving time or up to 24 hours.