http://www.cnn.com/2008/LIVING/perso...ity/index.html
This is possibly one of the biggest warning signs for the online industry. Credit card debt is mounting, and looking like it is going to be the next frontier of defaults. This means that more potential customers are running their cards to the max, and therefore we are more likely to see declines for sales, renewals, and such.
I also wouldn't be shocked to see credit card companies try to weasel out of paying stuff by charging back any non-hard good purchases in the 3 or 4 months before a card defaults. That would be a very good way for them to lower their exposure.