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I'm pretty sure this was mentioned in an earlier post but the PVP.net buddy window (while it has many flaws, which I'm sure the incoming patch will correct) needs to be able to communicate to you in game, This is a shameless re-post of that because i think its damn important.
Sent messages should pop up in there own window. I would say have them appear in the existing chat window but, you don't want important game chat being flooded out by your goofy friends. also, of course in game options, such as DND, invis, etc, should be implemented to allow blocking of said goofy friends.