StillTasty.com lets you know whether you should toss that thing in the fridge, and how you can extend its life in the first place. Type in your food into the search box, or browse by category. Depending on how the food is stored, the site spits out a nice graphical breakdown, plus storage tips. A good way to save money, the environment, eat healthier, and solve disputes in the kitchen!
StillTasty [Official Site] (Thanks to Anne!)