Lime Yogurt Cake w/Blackberry Sauce

Do you ever need an excuse to make a cake?  Well my excuse for making this cake was that I happen to have all the ingredients.  Plus, it seemed, based on the ingredient list, that it would be a pretty healthy version of a cake, as far as cakes go.  It definitely wasn't as sweet as your normal birthday cake, but it was good and refreshing.  My mom, who happened to be visiting when I made it, gave it two thumbs up.