Foam on External tank showed cracks

I've been lax in keeping up on Space news and such. I ran by this article onCNN before thanksgiving on the Shuttle and the crack problems on the external tanks.

"How do these cracks that we've found figure into that? We don't know," said John Chapman, manager of the External Tank Project at NASA's Marshall Space Flight Center. "It would certainly be premature to say the cracks play a factor in that. We don't know that right now. But they might."

....

NASA is still conducting tests to determine if the tank incurred cracks during testing and if the tank Discovery actually used had similar cracks.

"We haven't found any eureka, or smoking gun so far," Chapman said.