Not much gets used after three days in the fridge at my house. We are either tired of the same thing three days in a row or not risking it food saftey wise. When in doubt, throw it out! My wife will eat very little in the lines of leftovers after one day, so I have to eat them or they need to be frozen the same day they were made.
We try to freeze what we can from the big cooking events. The way we try to do things is like this. Whenever we make a large amount of say stuffed peppers, stuffed cabbages, multiple butts or whatever it happens to be, we try to put as much as we can into single or double serving size freezer containers the first night. This is almost part of the clean up process and it makes room in the fridge for the stuff that doesn't freeze as well.
We like the single serving size freezing method for a few reasons.
Sometimes all there is to freeze is a single serving, we don't have to plan on when to use a big frozen batch of food, midnite snacks are usually a single person event and the containers are the most common size at our place.