Your card was declined, several emails (including a link to update you card) were sent to you from 2checkout.com (or CC processor). I also personally sent you an email 12 hours before suspending the account.
Brett doesn't spend too much time with T35 stuff anymore, so you might want to forward that email to webmaster [at] t35.net.
If you want to update your credit card you can call up 2checkout.com directly (they have a toll free number). If they ask for a sales number, your sales number is: 2240066078. From what I can see, they tried charging your card on May-28-08, May-30-08, and June-02-08; It was declined all three times.
http://www.2checkout.com/community/help/