If it is authentic, the video would be the first time that Mr. Zarqawi had willingly shown his face to the world.

You have to ask, why?

Many experts believe that there are elements of a rivalry between Mr. Zarqawi and Mr. bin Laden.

Several other explanations for releasing the video also suggested themselves, including the possibility that the timing was meant to coincide with the first steps toward a new Iraqi government.

The video could have been intended to dispel any notion that Mr. Zarqawi is dead or unable to lead his movement.