Curry or any type of pasta dish is really good warmed up.
Cold pizza, chilis/goulashes obviously, meatloaf sandwiches FTW.
Let's get some clarification on the hamburger situation. If it is cook on the grill, but not placed on a bun, it is reheatable. If it has the bun on it in the fridge, it is no longer worthy of a second heating. Breads and grease are an awful thing to place in a fridge together.