Interesting that we haven't heard from Osama
Personally I think he went to Allah striaght from Tora Bora courtesy of the USAF. The fact that Osama has stayed quiet during the Iraq War is clear proof that he's dead. My guess is the intelligence agencies responsible for forging those later tapes of his have had their hands full dealing with the Iraq War (too busy to waste time on low level agit-prop).
Gary