I've gotten rather stagnant lately. I always have wheat, blond, red, sour mash and amber on hand. They get brewed anytime I put the last keg of any kind into the kegerater. I also brew a couple of Rye IPA's and Pilsners every year. Oatmeal stout and porters whenever they seem to be getting low (easy-cap bottles).
No particular schedule, just as needed.