Porter Goss is resigning from his position at the head of the CIA.
The CNN report includes speculation that Goss is cutting out because John Negroponte was appointed as the new DNI instead of him. I'll add that it's also possible that after two years at the head of the CIA, Goss believes it's a lost cause and doesn't want to be in charge when the next big crash happens -- especially as that may not be on Bush's watch, so he can't expect to receive a medal for his failures, the way Tenet did.
Or it could just be that he was doing a bad job.