One of the easiest things you can do to save LOTS of money is to keep an eye on you insurance (health, car, home, etc) rates. Often times you will go with a company and they will slowly (or quickly) raise the rates until they are no longer competitive. You can save hundreds of dollars with just a click of the button!
Here is a site that will help you compare rates. They will give you rates from GMAC, Farmers, Esurance, the Hartford, Liberty Mutual, and others (depending on which ones are available to you.
Have your information ready and make sure you are getting the best deal!