ismarc - I will get that fixed, thanks! And if you have a chance to set up a new account (even though you don't have any debt yourself) and give it a proper run through some time I'd love to hear some more of your thoughts on design/usability.
I would highlight the method, use it as a draw point and explain it somewhere, and have the website be the tool to track progress with the method. That's the catch with credit cards, they have a limit, but the part that is never pointed out is the total amount you really end up paying including interest.