SPRINKLE gelatine over warm water; set aside. Combine graham crumbs and margarine; press onto bottom of 9-inch springform pan.
BEAT cream cheese, sugar and zest in large bowl with mixer until well blended. Add gelatine mixture and melted chocolate; mix well. Gently stir in whipped cream just until blended. Pour over crust.
REFRIGERATE 4 hours. Run knife around rim of pan to loosen cake; remove rim. Top cheesecake with berries just before serving.