Credit worries once more haunt world markets, but frankly, the only headlines that matter are the ones that will be released by the Fed tomorrow afternoon.

The big story of today though is what former Fed Chairman Alan Greenspan is saying."Greenspan breaks 18 years of silence," says CNBC's senior economic correspondent Steve Liesman. It's not that we haven't heard Greenspan speak, but we have never had such an insightful look into Greenspan, the man and the economist. Also interesting, the dance he had with political Washington all those years as he served at the helm of the independent Federal Reserve.