I don't and have never nagged. In the past (read, first marriage) I would ask for what I need/want (e.g., a project to be done around the house), once. I made sure my request had been heard, understood completely and what time frame my significant other required to take care of the task. I would then then triple that time frame and awaited task completion. Time and again he never failed to disappoint.
Has it ever occurred to any of you ADD twinkies that nagging stems from the fact that you don't do what you promise you will do when you promise you will do it? Gotta love selective memory