We expect, based on Diablo 2 and a tweet from Bashiok that there's a diminishing return formula for magic find (though the details are still unclear), and that magic find is averaged across a party...but how does the diminishing return formula interact with parties?
Is the magic find from all items first averaged across the party, and then the diminishing formula applied to each player, or is it averaged across the party after applying diminishing returns to each player?
I'm wondering, if you have a small number of pieces of good magic find equipment, whether it's just as effective for one person to wear all of them as it would be to spread them across the group.