More details from AP:
In an audiotape broadcast Monday by Al-Jazeera satellite television, a man purported to be Osama bin Laden endorsed Abu-Musab al-Zarqawi as his deputy in Iraq and called for a boycott of next month's elections there. 
The voice on the tape described al-Zarqawi as the "emir," or prince, of al-Qaida in Iraq and said Muslims there should "listen to him." | "Emir Abu-Musab al-Zarqawi" - He's come a long way for a poor boy from Jordan. Emir's get to wear a Gold turban, don't they? |
The man speaking on the tape also referred to a statement last month in which al-Zarqawi, a Jordanian, declared allegiance to bin Laden and changed his group's name to al-Qaida in Iraq. The speaker called that "a great step on the path of unifying all the mujahedeen in establishing the state of righteousness and ending the state of injustice." | "One turban to rule them all, and in the darkness bind them." |
The voice on the tape broadcast Monday sounded like bin Laden's but there was no way to independently confirm the speaker's identity. Al-Jazeera broadcast excerpts of the tape while showing a still photo of the bearded bin Laden, wearing a white robe and head covering. |