Lagniappe, for the uninitiated, is a term that means a little gift or something extra.
Down in the South, particularly around N'Awlins, it's often seen on restaurant menus as things you might add to your steak--lump crab, mushrooms, or shrimp. I thought it was the perfect term for a collection of bonus material, like bonus epilogues and deleted scenes. I don't have them for all my books (didn't have time to write them during all the years I was working a day job), but I'm writing them now and this is where you can find them.