Combine jello and boiling water in a large bowl. Stir in cranberry sauce & break it up into the jello mixture. Add pineapple and 1/2 cup walnuts & mix well. Pour into a 9x13 pan and refrigerate until set.
Beat together sour cream and cream cheese & spread over salad. Sprinkle with 1/4 cup walnuts. Chill until ready to serve.