I second this approach. List your debts from smallest largest. Plan to at least pay the minimum on each one. With any money left over, apply it to the smallest balance - i.e., you are paying above the minimum due on it and minimum on the rest. When that debt is paid off, roll all of that money onto the next smallest balance and do the same thing. It's referred to as the "debt snowball". Check out this website for info:

Real Debt Help - Get out of debt with Dave Ramsey's Total Money Makeover Plan.