I have used a Menu plan for the last 15 years. It has saved my family thousands of dollars and is really quite simple to manage. In today's economic times, making every dollar you earn work for you is key. I had intended to write out how I do it, then as I was researching resources for links, I found so many wonderful posts already explaining everything in complete detail, why re-write it. I will just point you in the right direction.
Remember to read the comments and go to the other links in these posts. There is a ton of information and ideas. I have learned so much, I know you will too!