Ever wonder whether the food that's been sitting in your fridge for some time is still edible? I know I often do. I usually make a determination based on a glance at expiration dates and a possibly risky sniff. Slate tells us why we shouldn't pay much mind to sell by dates. But I've also often made use of a handy Web site called Still Tasty to get a better idea of just how far I can push my luck or just to find out how best to store certain foods (i.e. in the refrigerator or in the cabinet?).