Ideally, you should cook corn the day you buy it for maximum sweetness before the sugars start turning to starch. What to do if you must store it? Our food-geek friends at Cook's Illustrated experimented with several methods, and here's their collective wisdom from Perfect Vegetables (America's Test Kitchen, $30):

"The hands-on winner entailed wrapping the corn (husk left on) in a wet paper bag and then in a plastic bag (any shopping bag will do). After 24 hours of storage [in the refrigerator], the corn stored this way was juicy and sweet – not starchy – and fresh tasting."