Seems like the best-researched article on the question. Apologies if this is out-of category; please move/sink/etc. as necessary. Just thought I'd share, having had a similar thought walking home from the bus stop last week.
Funny--just before I feel asleep I was watching the new George Carlin stand-up special, he mentioned the total amount of people that has ever lived in the world and he said it was around 100 billion, like the article mentioned.
Begs the question, if various eschatologies are correct, and we're lookin towards a massive resurrection of the dead after the last judgment (this is one of the most important aspects of Jewish faith for example) - Where the fuck are we going to put all of them? What will they eat? Or will the resurrected not eat? or maybe they'll be sinner-eating zombies?
I remember in the mid to late 80's when they used to say that "half the people who have ever lived, are alive today" which kind of implied a then 4 billion population doubled. 100 billion is obviously the result of new scientific evidence or yet another excuse to raise taxes to pay for healthcare.
That's assuming there's still anything left to ressurect. You can't come back to life, if you've been eaten by maggots, who were then eaten by birds, then eaten by people etc.