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I found it on IGN:
"Standing out was the discussion of grouping. It has become a given that if you're soloing in an MMORPG, you don't want to compete for enemies or loot, so you either group up with whoever comes along, or you try to find an isolated area. This is at odds with what most people say MMORPGS are about – cooperation – and ArenaNet wants to avoid this same pitfall. According to the post by stuido head Mike O'Brien, "when someone kills a monster, not just that player's party but everyone who was seriously involved in the fight gets 100% of the XP and loot for the kill." This veers pretty wildly from the more standard "tagging" method that most players are used to, and is designed to encourage all players – regardless of whether they are grouped or guilded, to work together to slay the big beasties."
Do you think this is the right way to make ppl play together? It's actually preety simple mechanic and yet I've never seen it in other mmos.
It seems like it's fixing kill stealing too.