I still think he's in the bottom of a cave somewhere. So far he hasn't put out any recordings with specific enough info on them to discount the idea that he died on december 17, 2001.
I don't believe Usama is alive either and believe the tapes ARE HIS VOICE, but a composite of many tapes he made.
Someone mentioned the Shuttle Accident and they are correct when they say he would have mentioned it, particularly since Iraq had mentioned it.
Guess Usama didn't anticipate that on his pre-recorded tapes. No doubt, he would have gloated over the death of Ramon.