I posted a poll at Daily Kos about 30 minutes ago. It asks people to comment on whether or not they've seen valid "proof of life" information on the world's most famous terrorist, since early 2002.
It also includes this poll:
Is Osama bin Laden:
alive
dead
doesn't matter
don't know
You have to be regestered there to take the poll or comment. But you can look at the results at this link.
Update - 11:45 p.m:
alive -- 18% -- 31 votes
dead -- 47% -- 81 votes
doesn't matter -- 16% -- 28 votes
don't know -- 17% -- 29 votes