Dave Ramsey uses the "debt snowball". His theory is to knock out the debts from smallest to largest without paying attention to interest rate. By doing it that way he says it gives you a sense of accomplishment, and keeps you going, rather than tackling a large debt first. Once the smaller debt is gone take that money and roll it on the the next larger debt, and so on, till all are gone.
Im going to study his site more. I know financially it makes more sense to pay the highest interest.
But paying an individual card off is also a big boost.