How long will grease (from bacon or roast) keep in the fridge? I kept all of the bacon grease from making bacon this weekend, and now I have a jar of solidified grease in the fridge. How long can I use this to impart bacony goodness to my fried vegetables before it goes bad?

What is the shelf life of the fat drippings from bacon, roast and other meats?
Depends on how many solids and how much water you have in it. If you've rendered, filtered, and refined it, it should last a few weeks easy. 

Note: my mother maintained it never EVER went bad, refrigerated or not. Lot of old time southern cooks will say the same, but they all go through it fast.