More threats. I hope they turn out like the [1] ones from last November, but it would be unwise to dismiss them out of hand. From [2] Reuters, with thanks to DC Watson:

A letter purporting to come from Osama bin Laden's militant Islamist al Qaeda network said a big attack on the United States was in the final stages of preparation, a London-based Arabic newspaper said on Thursday.

"We bring the good news to Muslims of the world that the expected 'Winds of Black Death' strike against America is now in its final stage...90 percent (ready) and God willing near," the letter said.

The letter, signed by the Abu Hafs al-Masri Brigades which said it is part of al Qaeda, was sent to the London-based al-Quds al-Arabi newspaper. A copy of the letter was faxed to Reuters in Dubai.

It was not possible to independently authenticate the letter.