One of my favorite soups is Mulligatawny. It's a really easy Indian soup that I got from the New England Soup Cookbook. The soup gained popularity after a particular Seinfeld episode. If you love the show as much as I do, you'll know what episode it's from.
I love the combination of spices (cumin, chili powder, curry) with the coconut milk, which adds some weight and sweetness to the soup. -- Drew