How to manage "busy"?

One of my keys to managing the business of life right now is cooking meals and freezing them on the weekends for the week days. This is something I started a little bit when I was doing my grad classes. Now, that I'm doing the single Mom thing and the boys are busy with their sport activities it's amazing how fast my days go. So I've started trying to make most of our meals on the weekend and freeze them to either make in a casserole dish for later or have in individual portion sizes so we can heat them up in the microwave and have a quick meal.