Grilled fruit is awesome, and if you've already got the grill fired up, why not break out of your burger rut and throw on some pineapple? Or a peach?
Don't think this is a dessert-only thing. Grilled fruit can be delicious in savory dishes, too. And in drinks! The only thing better than drinking a margarita, outside, on a summer night? Sipping a grilled grapefruit margarita, outside, on a summer night. Duh.