Ask HN: Case studies of equity splits between cofounders

I've seen the "dividing the pie" calculator, but I'm more curious as to actual examples of equity splits between cofounders. Below's one link. Any more out htere?

http://www.startup-book.com/2008/10/30/equity-split-in-start-ups/

On a related note, has the initial equity split between Zuckerberg and his cofounders ever been revealed? I know that he had assembled a team of 5, just wondering what the other guys (all of whom I believe have since departed FB) ended up with.