My Wamu card plays with dates as well and, maybe it's paranoia, but the dates always seem to fall on a Sunday. Maybe because if they're mailed, they can tack on late fees that Monday. I pay online, so it's not an issue really.
The interest rate fell this month, from 18.74% to 16.67%, still big, but not quite as bad. I'm making minimum rounded to the next $5 until I'm working again and not using it. I should have it paid off at that rate in 60 months.