Some foods actually improve after a few days in the fridge. When it comes to desserts, fruit-based cakes tend to age particularly nicely (perhaps lemon and apple flavors just need a few days to fully blossom). The trick to keeping a cake tasting fresh is to let it cool completely after it comes out of the oven. Then wrap it tightly in plastic and refrigerate. Let the dessert come to room temperature for about an hour before serving.
Get the recipes: Lemon and Almond Streamliner Cake and Spiced Apple Cake